159-700: The River Sheaf in Sheffield , South Yorkshire , England, flows northwards, past Dore , through Abbeydale and north of Heeley . It then passes into a culvert , through which it flows under the centre of Sheffield before joining the River Don . This lower section of the River Sheaf, together with the Don between the Blonk Street and Lady's Bridges , formed two sides of the boundary of Sheffield Castle . The main tributaries of
318-544: A temperate oceanic climate ( Cfb ) like the rest of the United Kingdom. The uplands of the Pennines to the west can create a cool, gloomy and wet environment, but they also provide shelter from the prevailing westerly winds, casting a " rain shadow " across the area. Between 1971 and 2000 Sheffield averaged 824.7 mm (32.47 in) of rain per year; December was the wettest month with 91.9 mm (3.62 in) and July
477-665: A 2% decline from the 1991 census. The city is part of the wider Sheffield urban area , which had a population of 640,720. In 2011 the racial composition of Sheffield's population was 84% White (81% White British , 0.5% White Irish , 0.1% Romani or Irish Traveller , 2.3% Other White ), 2.4% of mixed race (1.0% White and Black Caribbean, 0.2% White and Black African, 0.6% White and Asian, 0.6% Other Mixed), 8% Asian (1.1% Indian , 4% Pakistani , 0.6% Bangladeshi , 1.3% Chinese , 1.0% Other Asian), 3.6% Black (2.1% African, 1% Caribbean , 0.5% Other Black ), 1.5% Arab and 0.7% of other ethnic heritage. In terms of religion, 53% of
636-566: A 2008 report showed that the climate of Sheffield is warming faster than it has at any time during this period, with 1990 and 2006 being the hottest years on record. In collaboration with the Stockholm Environment Institute , Sheffield developed a carbon footprint (based on 2004–05 consumption figures) of 5,798,361 tonnes per year. This compares to the UK's total carbon footprint of 698,568,010 tonnes per year. The factors with
795-480: A Labour MP for the first time in its history. Sheffield is located at 53°22′59″N 1°27′57″W / 53.38297°N 1.4659°W / 53.38297; -1.4659 . It lies directly beside Rotherham , from which it is separated largely by the M1 motorway . Although Barnsley Metropolitan Borough also borders Sheffield to the north, the town itself is a few miles further away. The southern and western borders of
954-433: A density of 11.34 g/cm , which is greater than that of common metals such as iron (7.87 g/cm ), copper (8.93 g/cm ), and zinc (7.14 g/cm ). This density is the origin of the idiom to go over like a lead balloon . Some rarer metals are denser: tungsten and gold are both at 19.3 g/cm , and osmium —the densest metal known—has a density of 22.59 g/cm , almost twice that of lead. Lead
1113-492: A few radioactive isotopes. One of them is lead-210; although it has a half-life of only 22.2 years, small quantities occur in nature because lead-210 is produced by a long decay series that starts with uranium-238 (that has been present for billions of years on Earth). Lead-211, −212, and −214 are present in the decay chains of uranium-235, thorium-232, and uranium-238, respectively, so traces of all three of these lead isotopes are found naturally. Minute traces of lead-209 arise from
1272-463: A further seven were located on some of the smaller tributaries, or were more transitory in nature. The Sheaf supplied a greater variety of industry than the other Sheffield rivers, partly because of its close proximity to Derbyshire , with its mineral reserves of lead . The lead ore was brought to the area around Dore, Totley and Norton , which was then in Derbyshire. There were at least ten mills where
1431-531: A grinding wheel was added. With the building decaying, the site was sold to Sheffield Corporation in 1935. The roof of the building collapsed in 2006, but although there were calls to demolish it, the Friends of Whirlow Wheel campaigned for it to be retained until a use could be found for the site. Abbeydale Works is located just below the Limb Brook and was powered by two water wheels. In 1855, these were supplemented by
1590-520: A larger, automated version in 2020. The river continues below ground to the edge of the station, where it is joined underground by the Porter Brook , which emerges from its own culvert to flow beside the station car park before passing under the station from the west. The two rivers meet under platform 5a, currently under a wooden access cover but the Sheaf & Porter Rivers Trust intend to replace this with
1749-554: A lightwell and information signs. The river surfaces briefly by Pond Hill, before passing under the Ponds Forge district. It flows through a series of huge tunnels. A decaying concrete section of culvert follows until the Sheaf joins the Don under Castlegate bridge, opposite Blonk Street bridge, named after Benjamin Blonk, who was the tenant of Castle Orchards Wheel from the 1750s to the 1770s. The Environment Agency measure water quality of
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#17328491088941908-463: A move to online shopping, which had increased because of the COVID-19 pandemic . John Lewis received £3 million of public funding from Sheffield City Council in 2020 to keep the local store open. The local Debenhams branches are expected to re-open after the lifting of the 2021 COVID-19 lockdown restrictions, but only to clear existing stock, after which it is expected the stores will close. With
2067-558: A neutron and become thallium-204; this undergoes beta decay to give stable lead-204; on capturing another neutron, it becomes lead-205, which has a half-life of around 17 million years. Further captures result in lead-206, lead-207, and lead-208. On capturing another neutron, lead-208 becomes lead-209, which quickly decays into bismuth-209. On capturing another neutron, bismuth-209 becomes bismuth-210, and this beta decays to polonium-210, which alpha decays to lead-206. The cycle hence ends at lead-206, lead-207, lead-208, and bismuth-209. In
2226-466: A polyhedral vertex and contributes two electrons to each covalent bond along an edge from their sp hybrid orbitals, the other two being an external lone pair . They may be made in liquid ammonia via the reduction of lead by sodium . Lead can form multiply-bonded chains , a property it shares with its lighter homologs in the carbon group. Its capacity to do so is much less because the Pb–Pb bond energy
2385-589: A public space to link these two areas, the Millennium Square , was opened in May 2006. Additional developments included the remodelling of Sheaf Square , in front of the refurbished railway station: the square contains "The Cutting Edge", a sculpture designed by Si Applied Ltd and made from Sheffield steel. Recent development known as the 'Heart of the City' includes the restoration of the listed Leah's Yard complex. Sheffield
2544-569: A relatively low melting point . When freshly cut, lead is a shiny gray with a hint of blue. It tarnishes to a dull gray color when exposed to air. Lead has the highest atomic number of any stable element and three of its isotopes are endpoints of major nuclear decay chains of heavier elements. Lead is a relatively unreactive post-transition metal . Its weak metallic character is illustrated by its amphoteric nature; lead and lead oxides react with acids and bases , and it tends to form covalent bonds . Compounds of lead are usually found in
2703-437: A significant partial positive charge on lead. The result is a stronger contraction of the lead 6s orbital than is the case for the 6p orbital, making it rather inert in ionic compounds. The inert pair effect is less applicable to compounds in which lead forms covalent bonds with elements of similar electronegativity, such as carbon in organolead compounds. In these, the 6s and 6p orbitals remain similarly sized and sp hybridization
2862-438: A single decay chain). In total, 43 lead isotopes have been synthesized, with mass numbers 178–220. Lead-205 is the most stable radioisotope, with a half-life of around 1.70 × 10 years. The second-most stable is lead-202, which has a half-life of about 52,500 years, longer than any of the natural trace radioisotopes. Bulk lead exposed to moist air forms a protective layer of varying composition. Lead(II) carbonate
3021-401: A steam engine, but the site declined after 1900. It was given to Sheffield Corporation in 1935 as an industrial museum, and only an active campaign by members of a local history group prevented its demolition. Restoration eventually began in 1964, and in 1970 it was opened as a museum, known as Abbeydale Industrial Hamlet . The Abbey Brook then joins the river from the east, below which the river
3180-449: A structure, with every alternate layer of oxygen atoms absent. Negative oxidation states can occur as Zintl phases , as either free lead anions, as in Ba 2 Pb, with lead formally being lead(−IV), or in oxygen-sensitive ring-shaped or polyhedral cluster ions such as the trigonal bipyramidal Pb 5 ion, where two lead atoms are lead(−I) and three are lead(0). In such anions, each atom is at
3339-469: Is Labour 36, Liberal Democrats 27, the Green Party 14, Conservative 0 and Independent 7. The city also has a Lord Mayor ; though now simply a ceremonial position, in the past the office carried considerable authority, with executive powers over the finances and affairs of the city council. The position of Lord Mayor is elected on an annual basis. For much of its history the council was controlled by
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#17328491088943498-590: Is 6 times higher, copper 10 times, and mild steel 15 times higher); it can be strengthened by adding small amounts of copper or antimony . The melting point of lead—at 327.5 °C (621.5 °F) —is very low compared to most metals. Its boiling point of 1749 °C (3180 °F) is the lowest among the carbon-group elements. The electrical resistivity of lead at 20 °C is 192 nanoohm -meters, almost an order of magnitude higher than those of other industrial metals (copper at 15.43 nΩ·m ; gold 20.51 nΩ·m ; and aluminium at 24.15 nΩ·m ). Lead
3657-516: Is a neurotoxin that accumulates in soft tissues and bones. It damages the nervous system and interferes with the function of biological enzymes , causing neurological disorders ranging from behavioral problems to brain damage, and also affects general health, cardiovascular, and renal systems. Lead's toxicity was first documented by ancient Greek and Roman writers, who noted some of the symptoms of lead poisoning , but became widely recognized in Europe in
3816-401: Is a superconductor at temperatures lower than 7.19 K ; this is the highest critical temperature of all type-I superconductors and the third highest of the elemental superconductors. Natural lead consists of four stable isotopes with mass numbers of 204, 206, 207, and 208, and traces of six short-lived radioisotopes with mass numbers 209–214 inclusive. The high number of isotopes
3975-420: Is a common constituent; the sulfate or chloride may also be present in urban or maritime settings. This layer makes bulk lead effectively chemically inert in the air. Finely powdered lead, as with many metals, is pyrophoric , and burns with a bluish-white flame. Fluorine reacts with lead at room temperature, forming lead(II) fluoride . The reaction with chlorine is similar but requires heating, as
4134-591: Is a corruption of shed or sheth , which refers to a divide or separation . The second half of the name Sheffield refers to a field, or forest clearing. Combining the two words, it is believed that the name refers to an Anglo-Saxon settlement in a clearing by the confluence of the River Don and River Sheaf. [REDACTED] Kingdom of England c. 12th century–1707 [REDACTED] Kingdom of Great Britain 1707–1801 [REDACTED] United Kingdom of Great Britain and Ireland 1801–1922 [REDACTED] United Kingdom 1922–present The area now occupied by
4293-775: Is a mixed sulfide derived from galena; anglesite , PbSO 4 , is a product of galena oxidation; and cerussite or white lead ore, PbCO 3 , is a decomposition product of galena. Arsenic , tin , antimony , silver , gold , copper , bismuth are common impurities in lead minerals. World lead resources exceed two billion tons. Significant deposits are located in Australia, China, Ireland, Mexico, Peru, Portugal, Russia, United States. Global reserves—resources that are economically feasible to extract—totaled 88 million tons in 2016, of which Australia had 35 million, China 17 million, Russia 6.4 million. Typical background concentrations of lead do not exceed 0.1 μg/m in
4452-426: Is a strong oxidizing agent, capable of oxidizing hydrochloric acid to chlorine gas. This is because the expected PbCl 4 that would be produced is unstable and spontaneously decomposes to PbCl 2 and Cl 2 . Analogously to lead monoxide , lead dioxide is capable of forming plumbate anions. Lead disulfide and lead diselenide are only stable at high pressures. Lead tetrafluoride , a yellow crystalline powder,
4611-404: Is a very soft metal with a Mohs hardness of 1.5; it can be scratched with a fingernail. It is quite malleable and somewhat ductile. The bulk modulus of lead—a measure of its ease of compressibility—is 45.8 GPa . In comparison, that of aluminium is 75.2 GPa; copper 137.8 GPa; and mild steel 160–169 GPa. Lead's tensile strength , at 12–17 MPa, is low (that of aluminium
4770-475: Is also related to other efforts to rejuvenate the Fargate area, such as a new mixed-use events and coworking hub at 20–26 Fargate, also overseen by Sheffield City Council. Lead Lead (pronounced "led") is a chemical element ; it has symbol Pb (from Latin plumbum ) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable , and also has
4929-429: Is bordered by Millhouses Park . In order to reduce flooding and pollution of the river when the sewerage system is overloaded by heavy rainfall, Yorkshire Water excavated the park in 2004/5 to construct a tank capable of holding 10,000 cubic metres (350,000 cu ft) of storm water. The decision to build a tank rather than a vertical shaft was made after test boreholes found hard rock and high groundwater pressure in
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5088-445: Is common for the carbon group. The divalent state is rare for carbon and silicon , minor for germanium, important (but not prevailing) for tin, and is the more important of the two oxidation states for lead. This is attributable to relativistic effects , specifically the inert pair effect , which manifests itself when there is a large difference in electronegativity between lead and oxide , halide , or nitride anions, leading to
5247-408: Is consistent with lead's atomic number being even. Lead has a magic number of protons (82), for which the nuclear shell model accurately predicts an especially stable nucleus. Lead-208 has 126 neutrons, another magic number, which may explain why lead-208 is extraordinarily stable. With its high atomic number, lead is the heaviest element whose natural isotopes are regarded as stable; lead-208
5406-414: Is exploited in the synthesis of other lead compounds. Few inorganic lead(IV) compounds are known. They are only formed in highly oxidizing solutions and do not normally exist under standard conditions. Lead(II) oxide gives a mixed oxide on further oxidation, Pb 3 O 4 . It is described as lead(II,IV) oxide , or structurally 2PbO·PbO 2 , and is the best-known mixed valence lead compound. Lead dioxide
5565-554: Is greater than that of the broader region of Yorkshire and the Humber. Sheffield had a population of 556,500 at the 2021 census, making it the second largest city in the Yorkshire and the Humber region. The Sheffield Built-up Area , of which the Sheffield sub-division is the largest part, had a population of 685,369 also including the town of Rotherham . The district borough , governed from
5724-502: Is more prevalent than most other elements with atomic numbers greater than 40. Primordial lead—which comprises the isotopes lead-204, lead-206, lead-207, and lead-208—was mostly created as a result of repetitive neutron capture processes occurring in stars. The two main modes of capture are the s- and r-processes . In the s-process (s is for "slow"), captures are separated by years or decades, allowing less stable nuclei to undergo beta decay . A stable thallium-203 nucleus can capture
5883-650: Is not stable, as both the lead(III) ion and the larger complexes containing it are radicals . The same applies for lead(I), which can be found in such radical species. Numerous mixed lead(II,IV) oxides are known. When PbO 2 is heated in air, it becomes Pb 12 O 19 at 293 °C, Pb 12 O 17 at 351 °C, Pb 3 O 4 at 374 °C, and finally PbO at 605 °C. A further sesquioxide , Pb 2 O 3 , can be obtained at high pressure, along with several non-stoichiometric phases. Many of them show defective fluorite structures in which some oxygen atoms are replaced by vacancies: PbO can be considered as having such
6042-741: Is over three and a half times lower than that of the C–C bond . With itself, lead can build metal–metal bonds of an order up to three. With carbon, lead forms organolead compounds similar to, but generally less stable than, typical organic compounds (due to the Pb–C bond being rather weak). This makes the organometallic chemistry of lead far less wide-ranging than that of tin. Lead predominantly forms organolead(IV) compounds, even when starting with inorganic lead(II) reactants; very few organolead(II) compounds are known. The most well-characterized exceptions are Pb[CH(SiMe 3 ) 2 ] 2 and plumbocene . The lead analog of
6201-655: Is particularly well known, is from 1297 when a tax return for 'Robert the Cutler' was submitted. A key reason for Sheffield's success in the production of cutlery lies in its geographic makeup. The abundance of streams in the area provided water power and the geological formations in the Hope Valley , in particular, provided sufficient grit stones for grinding wheels. In the 17th century, the Company of Cutlers in Hallamshire , which oversaw
6360-462: Is rated good or fail. The water quality of the Sheaf was as follows in 2019: The river is only rated moderate for ecological status due to the fact that the channel has been heavily modified by human activity. Like most rivers in the UK, the chemical status changed from good to fail in 2019, due to the presence of polybrominated diphenyl ethers (PBDE), perfluorooctane sulphonate (PFOS) and mercury compounds, none of which had previously been included in
6519-415: Is stable, but less so than the difluoride . Lead tetrachloride (a yellow oil) decomposes at room temperature, lead tetrabromide is less stable still, and the existence of lead tetraiodide is questionable. Some lead compounds exist in formal oxidation states other than +4 or +2. Lead(III) may be obtained, as an intermediate between lead(II) and lead(IV), in larger organolead complexes; this oxidation state
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6678-413: Is still energetically favorable. Lead, like carbon, is predominantly tetravalent in such compounds. There is a relatively large difference in the electronegativity of lead(II) at 1.87 and lead(IV) at 2.33. This difference marks the reversal in the trend of increasing stability of the +4 oxidation state going down the carbon group; tin, by comparison, has values of 1.80 in the +2 oxidation state and 1.96 in
6837-476: Is the Meers Brook , culverted for its last section under the suburban district of Meersbrook . Just below the junction is Heeley Station, built on the site of Heeley Wheel. The mill was demolished and the river was diverted by the railway company. Other sections of the river were also re-aligned in the 1860s to make way for the railway, and the weir at the site of Cooper Wheel, which can be seen from Havelock bridge,
6996-448: Is the heaviest stable nucleus. (This distinction formerly fell to bismuth , with an atomic number of 83, until its only primordial isotope , bismuth-209, was found in 2003 to decay very slowly.) The four stable isotopes of lead could theoretically undergo alpha decay to isotopes of mercury with a release of energy, but this has not been observed for any of them; their predicted half-lives range from 10 to 10 years (at least 10 times
7155-529: Is the origin of the English word " plumbing ". Its ease of working, its low melting point enabling the easy fabrication of completely waterproof welded joints, and its resistance to corrosion ensured its widespread use in other applications, including pharmaceuticals, roofing, currency, warfare. Writers of the time, such as Cato the Elder , Columella , and Pliny the Elder , recommended lead (and lead-coated) vessels for
7314-525: Is the so-called inert pair effect : the 6s electrons of lead become reluctant to participate in bonding, stabilising the +2 oxidation state and making the distance between nearest atoms in crystalline lead unusually long. Lead's lighter carbon group congeners form stable or metastable allotropes with the tetrahedrally coordinated and covalently bonded diamond cubic structure. The energy levels of their outer s- and p-orbitals are close enough to allow mixing into four hybrid sp orbitals. In lead,
7473-528: Is the sole remaining independent steel works in the world and dominates the north-east of Sheffield around the Lower Don Valley . The firm has a global reputation for producing the largest and most complex steel forgings and castings and is certified to produce critical nuclear components, with recent projects including the Royal Navy 's Astute -class submarines. The firm also has the capacity for pouring
7632-446: Is usefully exploited: lead tetraacetate is an important laboratory reagent for oxidation in organic synthesis. Tetraethyllead, once added to automotive gasoline, was produced in larger quantities than any other organometallic compound, and is still widely used in fuel for small aircraft . Other organolead compounds are less chemically stable. For many organic compounds, a lead analog does not exist. Lead's per-particle abundance in
7791-805: The Advanced Manufacturing Park , situated just over the boundary in the borough of Rotherham, by Sheffield's universities and other independent research organisations. Organisations located on the AMP include the Advanced Manufacturing Research Centre (AMRC, a research partnership between the Boeing Company and the University of Sheffield ), Castings Technology International (CTI), The Welding Institute (TWI), Rolls-Royce plc and McLaren Automotive . Forgemasters , founded in 1805,
7950-651: The City Lofts Tower and accompanying St Paul's Place , Velocity Living and the Moor redevelopment, the forthcoming NRQ and the Winter Gardens , Peace Gardens , Millennium Galleries and many projects completed under the Sheffield One redevelopment agency. The Sheffield economy grew from £5.6 billion in 1997 (1997 GVA ) to £9.2 billion in 2007 (2007 GVA). The "UK Cities Monitor 2008" placed Sheffield among
8109-647: The House of Wessex . After the Norman conquest of England , Sheffield Castle was built to protect the local settlements, and a small town developed that is the nucleus of the modern city. By 1296, a market had been established at what is now known as Castle Square , and Sheffield subsequently grew into a small market town . In the 14th century, Sheffield was already noted for the production of knives , as mentioned in Geoffrey Chaucer 's The Canterbury Tales , and by
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#17328491088948268-464: The Industrial Revolution , developing many significant technologies. In the 19th century, the city saw a huge expansion of its traditional cutlery trade, when processes for high-quality stainless steel and crucible steel were invented based on previous discoveries elsewhere. This fuelled an almost tenfold increase in the population. Sheffield received its municipal charter in 1843, becoming
8427-505: The Limb Brook —formed part of the border separating the Anglo-Saxon kingdoms of Mercia and Northumbria ; it remained on the border between Yorkshire and Derbyshire into the 20th century. The city of Sheffield derives its name from the Sheaf. The waters which form the River Sheaf rise as a series of streams on a ridge of gritstone between 6 and 7 miles (9.7 and 11.3 km) to
8586-656: The Loxley , the Porter Brook , the Rivelin and the Sheaf . Sixty-one per cent of Sheffield's entire area is green space and a third of the city lies within the Peak District national park and is the fifth largest city in England. There are more than 250 parks, woodlands and gardens in the city, which is estimated to contain around 4.5 million trees. Sheffield played a crucial role in
8745-608: The Phoenicians worked deposits in the Iberian peninsula ; by 1600 BC, lead mining existed in Cyprus , Greece , and Sardinia . Rome's territorial expansion in Europe and across the Mediterranean, and its development of mining, led to it becoming the greatest producer of lead during the classical era , with an estimated annual output peaking at 80,000 tonnes. Like their predecessors,
8904-643: The River Sheaf which runs through it. The city serves as the administrative centre of the City of Sheffield . It is historically part of the West Riding of Yorkshire and some of its southern suburbs were transferred from Derbyshire to the city council. It is the largest settlement in South Yorkshire. The city is in the eastern foothills of the Pennines and the valleys of the River Don with its four tributaries:
9063-519: The Royal Navy . While iron and steel have long been the main industries of Sheffield, coal mining has also been a major industry, particularly in the outlying areas, and the Palace of Westminster in London was built using limestone from quarries in the nearby village of Anston . Sheffield has a large public sector workforce, numbering 77,500 workers. During the period 1995 – 2008 (a period of growth for
9222-801: The Sheffield Arena , Don Valley Stadium and the Ponds Forge complex. Sheffield is changing rapidly as new projects regenerate some of the more run-down parts of the city. One such, the Heart of the City Project , has initiated a number of public works in the city centre: the Peace Gardens were renovated in 1998, the Millennium Galleries opened in April 2001, the Winter Gardens were opened in May 2003, and
9381-597: The Sheffield Blitz . The city was partially protected by barrage balloons managed from RAF Norton . More than 660 people died and many buildings were destroyed or left badly damaged, including the Marples Hotel, which was hit directly by a 500lb bomb, killing over 70 people. In the 1950s and 1960s, many of the city's slums were demolished, and replaced with housing schemes such as the Park Hill flats . Large parts of
9540-659: The Solar System is 0.121 ppb (parts per billion). This figure is two and a half times higher than that of platinum , eight times more than mercury , and seventeen times more than gold . The amount of lead in the universe is slowly increasing as most heavier atoms (all of which are unstable) gradually decay to lead. The abundance of lead in the Solar System since its formation 4.5 billion years ago has increased by about 0.75%. The solar system abundances table shows that lead, despite its relatively high atomic number,
9699-787: The Wortley Rural District . This area includes a significant part of the countryside surrounding the main urban region. Roughly a third of Sheffield lies in the Peak District National Park . No other English city had parts of a national park within its boundary, until the creation in March 2010 of the South Downs National Park , part of which lies within Brighton and Hove . According to the Köppen classification , Sheffield has
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#17328491088949858-732: The fall of Rome and did not reach comparable levels until the Industrial Revolution . Lead played a crucial role in the development of the printing press , as movable type could be relatively easily cast from lead alloys. In 2014, the annual global production of lead was about ten million tonnes, over half of which was from recycling. Lead's high density, low melting point, ductility and relative inertness to oxidation make it useful. These properties, combined with its relative abundance and low cost, resulted in its extensive use in construction , plumbing , batteries , bullets , shots , weights , solders , pewters , fusible alloys , lead paints , leaded gasoline , and radiation shielding . Lead
10017-401: The nucleus , and more shielded by smaller orbitals. The sum of the first four ionization energies of lead exceeds that of tin, contrary to what periodic trends would predict. This is explained by relativistic effects , which become significant in heavier atoms, which contract s and p orbitals such that lead's 6s electrons have larger binding energies than its 5s electrons. A consequence
10176-619: The +2 oxidation state rather than the +4 state common with lighter members of the carbon group . Exceptions are mostly limited to organolead compounds . Like the lighter members of the group, lead tends to bond with itself ; it can form chains and polyhedral structures. Since lead is easily extracted from its ores , prehistoric people in the Near East were aware of it . Galena is a principal ore of lead which often bears silver. Interest in silver helped initiate widespread extraction and use of lead in ancient Rome . Lead production declined after
10335-468: The +4 state. Lead(II) compounds are characteristic of the inorganic chemistry of lead. Even strong oxidizing agents like fluorine and chlorine react with lead to give only PbF 2 and PbCl 2 . Lead(II) ions are usually colorless in solution, and partially hydrolyze to form Pb(OH) and finally [Pb 4 (OH) 4 ] (in which the hydroxyl ions act as bridging ligands ), but are not reducing agents as tin(II) ions are. Techniques for identifying
10494-426: The 16th century. The river valley is broad, cutting through the underlying coal measures with its sandstones and clays , and the location of harder rock has been a major factor in where weirs and dams (a local word for the ponds used to hold water rather than the structure that creates the pond) have been located. There are some 28 sites which have well-documented and long standing mills associated with them, and
10653-555: The 18th century, and was dubbed " Steel City ". Many innovations in these fields have been made in Sheffield, for example Benjamin Huntsman discovered the crucible technique in the 1740s at his workshop in Handsworth . This process was rendered obsolete in 1856 by Henry Bessemer 's invention of the Bessemer converter . Thomas Boulsover invented Sheffield plate (silver-plated copper) in
10812-449: The 52.0 sq mi (134.7 km ) of national park and 4.20 sq mi (10.9 km ) of water this means that 61% of the city is greenspace . Despite this, about 64% of Sheffield householders live further than 300 m (328 yd) from their nearest greenspace, although access is better in less affluent neighbourhoods across the city. Sheffield also has a very wide variety of habitat , comparing favourably with any city in
10971-756: The City of Sheffield in 1893. International competition in iron and steel caused a decline in these industries in the 1970s and 1980s, coinciding with the collapse of coal mining in the area. The Yorkshire ridings became counties in their own right in 1889; the West Riding of Yorkshire county was disbanded in 1974. The city then became part of the county of South Yorkshire ; this has been made up of separately-governed unitary authorities since 1986. The 21st century has seen extensive redevelopment in Sheffield, consistent with other British cities. Sheffield's gross value added (GVA) has increased by 60% since 1997, standing at £11.3 billion in 2015. The economy has experienced steady growth, averaging around 5% annually, which
11130-484: The City of Sheffield is 548 m (1,798 ft) near High Stones and Margery Hill . The city's lowest point is just 29 m (95 ft) above sea level near Blackburn Meadows . However, 79% of the housing in the city is between 100 and 200 m (330 and 660 ft) above sea level and the highest residential street is Redmires Lane at 302 m (991 ft). This variation of altitudes across Sheffield has led to frequent claims, particularly among locals, that
11289-613: The City of Sheffield is believed to have been inhabited since at least the late Upper Paleolithic , about 12,800 years ago. The earliest evidence of human occupation in the Sheffield area was found at Creswell Crags to the east of the city. In the Iron Age the area became the southernmost territory of the Pennine tribe called the Brigantes . It is this tribe who are thought to have constructed several hill forts in and around Sheffield. Following
11448-606: The Egyptians had used lead for sinkers in fishing nets , glazes , glasses , enamels , ornaments . Various civilizations of the Fertile Crescent used lead as a writing material , as coins , and as a construction material . Lead was used by the ancient Chinese as a stimulant , as currency , as contraceptive , and in chopsticks . The Indus Valley civilization and the Mesoamericans used it for making amulets ; and
11607-599: The Environment Agency to clear local river channels since the 2007 event. In 2014 Sheffield Council's cabinet approved plans to further reduce the possibility of flooding by adopting plans to increase water catchment on tributaries of the River Don. Another flood hit the city in 2019 , resulting in shoppers being contained in Meadowhall Shopping Centre. Between 2014 and 2018, there were disputes between
11766-631: The Labour Party, and was noted for its leftist sympathies; during the 1980s, when Sheffield City Council was led by David Blunkett , the area gained the epithet the " Socialist Republic of South Yorkshire ". However, the Liberal Democrats controlled the Council between 1999 and 2001 and took control again from 2008 to 2011. The majority of council-owned facilities are operated by independent charitable trusts. Sheffield International Venues runs many of
11925-605: The River Sheaf Walk and Cycleway. This follows the course of the river for much of its length, but there are some significant gaps, and the Trust is working to ensure that the routes for the missing links are protected in the planning process. Sheffield Sheffield is a city in South Yorkshire , England, situated 29 miles (47 km) south of Leeds and 32 miles (51 km) east of Manchester . Its name derives from
12084-498: The River Sheaf Walk is fully signposted and contains 10 'Sheaf Wheels'. River Sheaf Walk link Sheffield City Council, the Environment Agency and Sheaf & Porter Rivers Trust are currently working on a vision for the former Castle Market site. This involves removing the structurally decaying concrete culvert at the end of the River Sheaf, daylighting the section and replacing it with a new city centre park. The Sheaf & Porter Rivers Trust are also campaigning for improvements to
12243-471: The Romans obtained lead mostly as a by-product of silver smelting. Lead mining occurred in central Europe , Britain , Balkans , Greece , Anatolia , Hispania , the latter accounting for 40% of world production. Lead tablets were commonly used as a material for letters. Lead coffins, cast in flat sand forms and with interchangeable motifs to suit the faith of the deceased, were used in ancient Judea . Lead
12402-506: The Sheaf are the Porter Brook , which joins it beneath Sheffield Midland station , and the Meers Brook . The river has been polluted upstream through centuries of industrial activity, including iron and steel working, and is only slowly recovering. The river used to provide the power for metal works such as the Grade I-listed Abbeydale Industrial Hamlet . A River Sheaf Walk has been developed which follows
12561-462: The Sheaf, having been built around 1280 by the Canons of Beauchief Abbey as a fulling mill . After the abbey was dissolved in the reign of Henry VIII , it was used as a cutlers wheel. By 1746, John Tyzack was using it for grinding scythes, in 1797 Thomas Biggin was making knives for cutting hay and straw, and it was being used as a sickle mill in 1805. After a brief spell as a paper mill around 1826, it
12720-401: The Sheffield district of Hallam was the highest ranking area outside London for overall wealth, the proportion of people earning over £60,000 a year standing at almost 12%. A survey by Knight Frank revealed that Sheffield was the fastest-growing city outside London for office and residential space and rents during the second half of 2004. This can be seen in a surge of redevelopments, including
12879-474: The South Yorkshire authorities, as well as Bolsover District , Borough of Chesterfield , Derbyshire Dales , North East Derbyshire and Bassetlaw District . In 2014, the Sheffield City Region Combined authority was formed by the South Yorkshire local authorities with the other councils as non-constituent members and the partnership integrated with the authority structure. In September 2020,
13038-477: The United Kingdom: urban, parkland and woodland, agricultural and arable land, moors, meadows and freshwater-based habitats. There are six areas within the city that are designated as sites of special scientific interest . The present city boundaries were set in 1974 (with slight modification in 1994), when the former county borough of Sheffield merged with Stocksbridge Urban District and two parishes from
13197-666: The aforementioned government departments. Sheffield City Council , which is also a major public sector employer in the city, employs over 8,000 people, spread across four different sections (known as portfolios). Sheffield City Council is also the Local Education Authority (LEA) and as such manages all states schools and their associated staff. As part of its mandate to provide public services, Sheffield City Council maintains contracts with three private contractors – Amey , Veolia & Capita (contract ending in 2020). Together, these contractors provide additional employment in
13356-400: The area. The project cost £7.5 million, and included three more conventional shafts further down the river, which provide an additional 3,175 cubic metres (112,100 cu ft) of storage. Little London wheel was used for the cutlery trade from the earliest known records in 1720. By 1814 it was described as a grinding and plating forge, and later was used for the production of scythes. When
13515-424: The assessment. In September 2014 Sheffield City Council announced plans for flood defences on the River Sheaf and its tributaries costing £12 million. Download coordinates as: In early 2019, the Sheaf & Porter Rivers Trust was set up to encourage the regeneration and improvement of the River Sheaf & Porter Brook. Aims and Objectives of the Organisation Although some key gaps remain missing,
13674-600: The atmosphere; 100 mg/kg in soil; 4 mg/kg in vegetation, 5 μg/L in fresh water and seawater. The modern English word lead is of Germanic origin; it comes from the Middle English leed and Old English lēad (with the macron above the "e" signifying that the vowel sound of that letter is long). The Old English word is derived from the hypothetical reconstructed Proto-Germanic * lauda- ('lead'). According to linguistic theory, this word bore descendants in multiple Germanic languages of exactly
13833-452: The authority changed to its current name. The city returns five members of parliament to the House of Commons , with a sixth, the Member of Parliament for Penistone and Stocksbridge representing parts of Sheffield and Barnsley. The former Deputy Prime Minister Nick Clegg was an MP for Sheffield, representing Sheffield Hallam from 2005 until he was unseated 2017 , when the seat returned
13992-400: The booming cutlery industry in the area and remains to this day, was established and focused on markets outside the Sheffield area, leading to the gradual establishment of Sheffield as a respected producer of cutlery. this gradually developed from a national reputation into an international one. Playing a crucial role in the Industrial Revolution , the city became an industrial powerhouse in
14151-744: The city and many others in the UK), the number of jobs in the city increased by 22% and 50% of these were in the public sector. Major public sector employers include the National Health Service , The University of Sheffield, Sheffield Hallam University , and numerous government departments and agencies including the Home Office (Visas & Immigration), Department for Education & Department for Business, Innovation & Skills . Recently developed offices in St Paul's Place and Riverside Exchange play host to
14310-415: The city are shared with Derbyshire ; in the first half of the 20th century Sheffield extended its borders south into Derbyshire, annexing a number of villages, including Totley , Dore and the area now known as Mosborough Townships. Sheffield is a geographically diverse city. It nestles in the eastern foothills of the Pennines , between the main upland range and Peak District National Park to
14469-409: The city as the cutlery and steel industries flourished. The population continued to grow until the mid-20th century, at which point, due to industrial decline, the population began to contract. However, by the early 21st century, the population had begun to grow once again. The population of Sheffield peaked in 1951 at 577,050, and has since declined steadily. However, the mid-2007 population estimate
14628-471: The city centre were also cleared to make way for a new system of roads. In February 1962, the city was devastated by the Great Sheffield Gale ; winds of up to 97 mph (156 km/h) killed four people and damaged 150,000 houses, more than two-thirds of the city's housing stock at the time. Increased automation and competition from abroad resulted in the closure of many steel mills . The 1980s saw
14787-459: The city council and residents over the fate of the city's 36,000 highway trees. Around 4,000 highway trees have since been felled as part of the 'Streets Ahead' Private Finance Initiative (PFI) contract signed in 2012 by the city council, Amey plc and the Department for Transport to maintain the city streets. The tree fellings have resulted in many arrests of residents and other protesters across
14946-543: The city even though most felled trees in the city have been replanted, including those historically felled and not previously replanted. The protests eventually stopped in 2018 after the council paused the tree felling programme as part of a new approach developed by the council for the maintenance of street trees in the city. In May 2022, Sheffield was named a " Tree City of the World " in recognition of its work to sustainably manage and maintain urban forests and trees. This honour
15105-702: The city was built on Seven Hills. As this claim is disputed, it likely originated as a joke referencing the Seven Hills of Rome . Estimated to contain around 4.5 million trees, Sheffield has more trees per person than any other city in Europe and is considered to be one of the greenest cities in England and the UK, which was further reinforced when it won the 2005 Entente Florale competition. With more than 250 parks, woodlands and gardens, it has over 170 woodlands (covering 10.91 sq mi or 28.3 km ), 78 public parks (covering 7.07 sq mi or 18.3 km ) and 10 public gardens. Added to
15264-547: The city's sporting and leisure facilities, including Sheffield Arena and the English Institute of Sport, Sheffield . Museums Sheffield and the Sheffield Industrial Museums Trust take care of galleries and museums owned by the council. The city of Sheffield is part of the wider South Yorkshire Mayoral Combined Authority , headed by mayor Oliver Coppard since 2022. The combined authority covers
15423-492: The city, had a population of 566,242 at the mid-2019 estimate, making it the 7th most populous district in England. It is one of eleven British cities that make up the Core Cities Group . In 2011, the unparished area had a population of 490,070. The city has a long sporting heritage and is home both to the world's oldest football club, Sheffield F.C. , and the world's oldest football ground, Sandygate . Matches between
15582-470: The city. Sheffield is a major retail centre, and is home to many High Street and department stores as well as designer boutiques. The main shopping areas in the city centre are on The Moor precinct, Fargate , Orchard Square and the Devonshire Quarter . Department stores in the city centre include Marks and Spencer and Atkinsons . Sheffield's main market was once Castle Market , built above
15741-412: The city; instead it is divided into 28 electoral wards , with each ward generally covering 4–6 areas. These electoral wards are grouped into six parliamentary constituencies . Sheffield is largely unparished , but Bradfield and Ecclesfield have parish councils, and Stocksbridge has a town council. The United Kingdom Census 2001 reported a resident population for Sheffield of 513,234,
15900-485: The course of the Earth's history, have remained in the crust instead of sinking deeper into the Earth's interior. This accounts for lead's relatively high crustal abundance of 14 ppm; it is the 36th most abundant element in the crust. The main lead-bearing mineral is galena (PbS), which is mostly found with zinc ores. Most other lead minerals are related to galena in some way; boulangerite , Pb 5 Sb 4 S 11 ,
16059-419: The current age of the universe). Three of the stable isotopes are found in three of the four major decay chains : lead-206, lead-207, and lead-208 are the final decay products of uranium-238 , uranium-235 , and thorium-232 , respectively. These decay chains are called the uranium chain , the actinium chain , and the thorium chain . Their isotopic concentrations in a natural rock sample depends greatly on
16218-525: The decline in high street shopping around the UK, efforts have been made to rejuvenate Sheffield City Centre and improve the retail and leisure offering. Major developments include Leopold Square , The Moor , St Paul's Place (a mixed use development) and the Heart of the City I & II projects. In March 2022 Sheffield City Council announced that a new leisure hub would be constructed at the southern end of Fargate. The £300,000 hub will feature cafes, shops and large screen TVs for sports events. The development
16377-554: The departure of the Romans, the Sheffield area may have been the southern part of the Brittonic kingdom of Elmet , with the rivers Sheaf and Don forming part of the boundary between this kingdom and the kingdom of Mercia . Gradually, Anglian settlers pushed west from the kingdom of Deira . A Britonnic presence within the Sheffield area is evidenced by two settlements called Wales and Waleswood close to Sheffield. The settlements that grew and merged to form Sheffield, however, date from
16536-424: The designation. A subsidiary aim of the green belt is to encourage recreation and leisure interests, with many rural landscape features and facilities included. Sheffield is made up of many suburbs and neighbourhoods, many of which developed from villages or hamlets that were absorbed into Sheffield as the city grew. These historical areas are largely ignored by the modern administrative and political divisions of
16695-428: The diiodide . Many lead(II) pseudohalides are known, such as the cyanide, cyanate, and thiocyanate . Lead(II) forms an extensive variety of halide coordination complexes , such as [PbCl 4 ] , [PbCl 6 ] , and the [Pb 2 Cl 9 ] n chain anion. Lead(II) sulfate is insoluble in water, like the sulfates of other heavy divalent cations . Lead(II) nitrate and lead(II) acetate are very soluble, and this
16854-531: The driest with 51.0 mm (2.01 in). July was also the hottest month, with an average maximum temperature of 20.8 °C (69.4 °F). The highest temperature ever recorded in the city of Sheffield was 39.4 °C (102.9 °F), on 19 July 2022. The average minimum temperature in January and February was 1.6 °C (34.9 °F), though the lowest temperatures recorded in these months can be between −10 and −15 °C (14 and 5 °F), although since 1960,
17013-489: The early 1600s it had become the main centre of cutlery manufacture in England outside London, overseen by the Company of Cutlers in Hallamshire . From 1570 to 1584, Mary, Queen of Scots , was imprisoned in Sheffield Castle and Sheffield Manor . During the 1740s, a form of the crucible steel process was discovered that allowed the manufacture of a better quality of steel than had previously been possible. In about
17172-407: The early 18th century. Stainless steel was invented by Harry Brearley in 1912, bringing affordable cutlery to the masses. The work of F. B. Pickering and T. Gladman throughout the 1960s, 1970s and 1980s was fundamental to the development of modern high-strength low-alloy steels. Further innovations continue, with new advanced manufacturing technologies and techniques being developed on
17331-515: The eastern and southern Africans used lead in wire drawing . Because silver was extensively used as a decorative material and an exchange medium, lead deposits came to be worked in Asia Minor from 3000 BC; later, lead deposits were developed in the Aegean and Laurion . These three regions collectively dominated production of mined lead until c. 1200 BC . Beginning c. 2000 BC,
17490-566: The element its chemical symbol Pb . The word * ɸloud-io- is thought to be the origin of Proto-Germanic * bliwa- (which also means 'lead'), from which stemmed the German Blei . The name of the chemical element is not related to the verb of the same spelling, which is derived from Proto-Germanic * laidijan- ('to lead'). Metallic lead beads dating back to 7000–6500 BC have been found in Asia Minor and may represent
17649-413: The first example of metal smelting . At that time, lead had few (if any) applications due to its softness and dull appearance. The major reason for the spread of lead production was its association with silver, which may be obtained by burning galena (a common lead mineral). The Ancient Egyptians were the first to use lead minerals in cosmetics, an application that spread to Ancient Greece and beyond;
17808-574: The former 1974–1986 South Yorkshire County Council area which functions either went to local or regional authorities. In 2004, as part of the Moving Forward: The Northern Way document, city regions were created in a collaboration with the three northern regional development agencies . These became independent Local enterprise partnerships in 2011. The area's partnership retains the Sheffield City Region name, covering
17967-462: The greatest impact are housing (34%), transport (25%), consumer (11%), private services (9%), public services (8%), food (8%) and capital investment (5%). Sheffield City Council has signed up to the 10:10 campaign. Sheffield is within a green belt region that extends into the wider surrounding counties, and is in place to reduce urban sprawl , prevent the towns and areas in the Sheffield built-up area conurbation from further convergence, protect
18126-430: The group. Lead dihalides are well-characterized; this includes the diastatide and mixed halides, such as PbFCl. The relative insolubility of the latter forms a useful basis for the gravimetric determination of fluorine. The difluoride was the first solid ionically conducting compound to be discovered (in 1834, by Michael Faraday ). The other dihalides decompose on exposure to ultraviolet or visible light, especially
18285-418: The identity of outlying communities, encourage brownfield reuse, and preserve nearby countryside. This is achieved by restricting inappropriate development within the designated areas, and imposing stricter conditions on permitted building. The main urban area and larger villages of the borough are exempt from the green belt area, but surrounding smaller villages, hamlets and rural areas are 'washed over' with
18444-446: The inert pair effect increases the separation between its s- and p-orbitals, and the gap cannot be overcome by the energy that would be released by extra bonds following hybridization. Rather than having a diamond cubic structure, lead forms metallic bonds in which only the p-electrons are delocalized and shared between the Pb ions. Lead consequently has a face-centered cubic structure like
18603-494: The largest single ingot (570 tonnes) in Europe and is currently in the process of expanding its capabilities. In July 2021 Forgemasters was bought outright by the UK Ministry of Defence for £2.56 million, with the intention of investing a further £400 million over the next decade. The decision was based on the important role Forgemasters plays in the construction of the UK nuclear submarine fleet as well other vessels for
18762-447: The late 19th century AD. A lead atom has 82 electrons , arranged in an electron configuration of [ Xe ]4f 5d 6s 6p . The sum of lead's first and second ionization energies —the total energy required to remove the two 6p electrons—is close to that of tin , lead's upper neighbor in the carbon group . This is unusual; ionization energies generally fall going down a group, as an element's outer electrons become more distant from
18921-560: The latter being stable only above around 488 °C. Litharge is the most commonly used inorganic compound of lead. There is no lead(II) hydroxide; increasing the pH of solutions of lead(II) salts leads to hydrolysis and condensation. Lead commonly reacts with heavier chalcogens. Lead sulfide is a semiconductor , a photoconductor , and an extremely sensitive infrared radiation detector . The other two chalcogenides, lead selenide and lead telluride , are likewise photoconducting. They are unusual in that their color becomes lighter going down
19080-441: The latter is not; this allows for lead–lead dating . As uranium decays into lead, their relative amounts change; this is the basis for uranium–lead dating . Lead-207 exhibits nuclear magnetic resonance , a property that has been used to study its compounds in solution and solid state, including in the human body. Apart from the stable isotopes, which make up almost all lead that exists naturally, there are trace quantities of
19239-533: The neutrons are arranged in complete shells in the atomic nucleus, and it becomes harder to energetically accommodate more of them. When the neutron flux subsides, these nuclei beta decay into stable isotopes of osmium , iridium , platinum . Lead is classified as a chalcophile under the Goldschmidt classification , meaning it is generally found combined with sulfur. It rarely occurs in its native , metallic form. Many lead minerals are relatively light and, over
19398-412: The ore was smelted in ore hearths , which used kiln-dried wood as the heat producing agent, and water-powered bellows to produce the temperatures required. As well as the lead smelting mills, there were a variety of corn and paper mills along the river, some of which were adapted in the 18th century to service the metal trades as they grew and expanded. Walk Mill was one of the earliest known mills on
19557-491: The outskirts of the town. The collapse of the dam wall of one of these reservoirs in 1864 resulted in the Great Sheffield Flood , which killed 270 people and devastated large parts of the town. The growing population led to the construction of many back-to-back dwellings that, along with severe pollution from the factories, inspired George Orwell in 1937 to write: "Sheffield, I suppose, could justly claim to be called
19716-474: The population are Christian, 6% are Muslim, 0.6% are Hindu, 0.4% are Buddhist, 0.2% are Sikh, 0.1% are Jewish, 0.4% belong to another religion, 31% have no religion and 7% did not state their religion. The largest quinary group is 20- to 24-year-olds (9%) because of the large university student population. The Industrial Revolution served as a catalyst for considerable population growth and demographic change in Sheffield. Large numbers of people were driven to
19875-418: The preparation of sweeteners and preservatives added to wine and food. The lead conferred an agreeable taste due to the formation of "sugar of lead" ( lead(II) acetate ), whereas copper vessels imparted a bitter flavor through verdigris formation. This metal was by far the most used material in classical antiquity, and it is appropriate to refer to the (Roman) Lead Age. Lead was to the Romans what plastic
20034-414: The presence of the Pb ion in water generally rely on the precipitation of lead(II) chloride using dilute hydrochloric acid. As the chloride salt is sparingly soluble in water, in very dilute solutions the precipitation of lead(II) sulfide is instead achieved by bubbling hydrogen sulfide through the solution. Lead monoxide exists in two polymorphs , litharge α-PbO (red) and massicot β-PbO (yellow),
20193-422: The presence of these three parent uranium and thorium isotopes. For example, the relative abundance of lead-208 can range from 52% in normal samples to 90% in thorium ores; for this reason, the standard atomic weight of lead is given to only one decimal place. As time passes, the ratio of lead-206 and lead-207 to lead-204 increases, since the former two are supplemented by radioactive decay of heavier elements while
20352-432: The r-process (r is for "rapid"), captures happen faster than nuclei can decay. This occurs in environments with a high neutron density, such as a supernova or the merger of two neutron stars . The neutron flux involved may be on the order of 10 neutrons per square centimeter per second. The r-process does not form as much lead as the s-process. It tends to stop once neutron-rich nuclei reach 126 neutrons. At this point,
20511-466: The railway was constructed, it crossed part of the dam, which was reduced in size by one eighth. By 1912, the water wheels had been modernised and there were two tilt hammers in operation. The owners moved their scythe production from Abbeydale Works to Little London on 1935, and the tilt hammers continued to be water-powered until the mid-1950s. Some of the equipment was dismantled in the 1970s and taken to Beamish Museum to be restored. The next tributary
20670-402: The remains of the castle. This has since been demolished. Sheffield Moor Market opened in 2013 and became the main destination for fresh produce. The market has 196 stalls and includes local and organic produce, as well as international fusion cuisine such as Russian, Jamaican and Thai. In March 2021 it was announced that the Sheffield branch of John Lewis would close due to falling sales and
20829-541: The resulting chloride layer diminishes the reactivity of the elements. Molten lead reacts with the chalcogens to give lead(II) chalcogenides. Lead metal resists sulfuric and phosphoric acid but not hydrochloric or nitric acid ; the outcome depends on insolubility and subsequent passivation of the product salt. Organic acids, such as acetic acid , dissolve lead in the presence of oxygen. Concentrated alkalis dissolve lead and form plumbites . Lead shows two main oxidation states: +4 and +2. The tetravalent state
20988-510: The river from Granville Square out to Millhouses Park and beyond to the Peak District . Until the 17th century the name Sheaf was written as Scheth or Sheath . Sidney Oldall Addy equates the origins of this word with the Old English shed (as in water-shed ) or sheth , which mean to divide, or separate. Historically, the Sheaf—;along with its tributaries the Meers Brook and
21147-426: The river systems in England. Each is given an overall ecological status, which may be one of five levels: high, good, moderate, poor and bad. There are several components that are used to determine this, including biological status, which looks at the quantity and varieties of invertebrates , angiosperms and fish. Chemical status, which compares the concentrations of various chemicals against known safe concentrations,
21306-507: The same meaning. There is no consensus on the origin of the Proto-Germanic * lauda- . One hypothesis suggests it is derived from Proto-Indo-European * lAudh- ('lead'; capitalization of the vowel is equivalent to the macron). Another hypothesis suggests it is borrowed from Proto-Celtic * ɸloud-io- ('lead'). This word is related to the Latin plumbum , which gave
21465-473: The same period, a technique was developed for fusing a thin sheet of silver onto a copper ingot to produce silver plating, which became widely known as Sheffield plate . These innovations spurred Sheffield's growth as an industrial town, but the loss of some important export markets led to a recession in the late 18th and early 19th century. The resulting poor conditions culminated in a cholera epidemic that killed 402 people in 1832. The population of
21624-424: The second half of the first millennium, and are of Anglo-Saxon and Danish origin. In Anglo-Saxon times, the Sheffield area straddled the border between the kingdoms of Mercia and Northumbria . The Anglo-Saxon Chronicle reports that Eanred of Northumbria submitted to Egbert of Wessex at the hamlet of Dore (now a suburb of Sheffield) in 829, a key event in the unification of the kingdom of England under
21783-491: The similarly sized divalent metals calcium and strontium . Pure lead has a bright, shiny gray appearance with a hint of blue. It tarnishes on contact with moist air and takes on a dull appearance, the hue of which depends on the prevailing conditions. Characteristic properties of lead include high density , malleability, ductility, and high resistance to corrosion due to passivation . Lead's close-packed face-centered cubic structure and high atomic weight result in
21942-588: The simplest organic compound , methane , is plumbane . Plumbane may be obtained in a reaction between metallic lead and atomic hydrogen. Two simple derivatives, tetramethyllead and tetraethyllead , are the best-known organolead compounds. These compounds are relatively stable: tetraethyllead only starts to decompose if heated or if exposed to sunlight or ultraviolet light. With sodium metal, lead readily forms an equimolar alloy that reacts with alkyl halides to form organometallic compounds such as tetraethyllead. The oxidizing nature of many organolead compounds
22101-546: The south west of the main city centre. The Blacka Dike , Needhams Dike and Redcar Brook combine to form Old Hay Brook, while Totley Brook is joined by Rodmoor Brook , and itself joins Old Hay Brook between Totley and Dore , after which the combined flow forms the Sheaf. Immediately below the junction, the river is crossed by the Hope Valley railway line , which then joins the Midland Main Line , and both cross back over to reach Dore & Totley railway station , which
22260-459: The station was built, but attempted to get compensation for loss of water power as a result of the work. At Granville Square, a large screen prevents debris from entering the culverts. Serious flooding in 1990 led to the construction of the first screen, and it was then refurbished in 2010, so that it could be continuously monitored by the Environment Agency . The Sheaf Screen was replaced by
22419-402: The street-trees dispute, and we wish to reiterate our previous apologies for our failings". Sheffield is governed at the local level by Sheffield City Council and is led by Councillor Tom Hunt (Assumed office 16 May 2023). It consists of 84 councillors elected to represent 28 wards : three councillors per ward. Following the 2024 local elections , the distribution of council seats
22578-541: The temperature at −8.7 °C (16.3 °F), recorded on 20 December, and states that to be the lowest December temperature since 1981.) The coldest temperature ever recorded in the city of Sheffield at Weston Park , since records began in 1882, is −14.6 °C (5.7 °F), registered in February 1895. The lowest daytime maximum temperature in the city since records began is −5.6 °C (21.9 °F), also recorded in February 1895. More recently, −4.4 °C (24.1 °F)
22737-498: The temperature has never fallen below −9.2 °C (15.4 °F), suggesting that urbanisation around the Weston Park site during the second half of the 20th century may prevent temperatures below −10 °C (14 °F) occurring. The coldest temperature to be recorded was −8.2 °C (17.2 °F) in 2010. (Note: The official Weston Park Weather Station statistics, which can also be viewed at Sheffield Central Library , has
22896-467: The top ten "best cities to locate a business today", the city occupying third and fourth places respectively for best office location and best new call centre location. The same report places Sheffield in third place regarding "greenest reputation" and second in terms of the availability of financial incentives. Sheffield has an international reputation for metallurgy and steel-making. The earliest official record of cutlery production, for which Sheffield
23055-425: The town grew rapidly throughout the 19th century; increasing from 60,095 in 1801 to 451,195 by 1901. The Sheffield and Rotherham railway was constructed in 1838, connecting the two towns. The town was incorporated as a borough in 1842, and was granted city status by letters patent in 1893. The influx of people also led to demand for better water supplies, and a number of new reservoirs were constructed on
23214-579: The two professional clubs, Sheffield United and Sheffield Wednesday , are known as the Steel City derby . The city is also home to the World Snooker Championship and the Sheffield Steelers , the UK's first professional ice hockey team. The name Sheffield , has its origins in Old English and derives from the name of a principal river in the city, the River Sheaf . This name, in turn,
23373-528: The ugliest town in the Old World ". The Great Depression hit the city in the 1930s, but as international tensions increased and the Second World War became imminent; Sheffield's steel factories were set to work manufacturing weapons and ammunition for the war effort. As a result, the city became a target for bombing raids, the heaviest of which occurred on the nights of 12 and 15 December 1940, now known as
23532-403: The very rare cluster decay of radium-223, one of the daughter products of natural uranium-235, and the decay chain of neptunium-237, traces of which are produced by neutron capture in uranium ores. Lead-213 also occurs in the decay chain of neptunium-237. Lead-210 is particularly useful for helping to identify the ages of samples by measuring its ratio to lead-206 (both isotopes are present in
23691-454: The west, and the lower-lying South Yorkshire Coalfield to the east. It lies at the confluence of five rivers: Don , Sheaf , Rivelin , Loxley and Porter . As such, much of the city is built on hillsides with views into the city centre or out to the countryside. Blake Street, in the S6 postcode area, is the third steepest residential street in England, with a gradient of 16.6°. The highest point in
23850-503: The worst of this run-down of Sheffield's industries, along with those of many other areas of the UK. The building of the Meadowhall Centre on the site of a former steelworks in 1990 was a mixed blessing, creating much-needed jobs but hastening the decline of the city centre. Attempts to regenerate the city were kick-started when the city hosted the 1991 World Student Games , which saw the construction of new sporting facilities such as
24009-453: Was 530,300, representing an increase of about 17,000 residents since 2001. Although a city, Sheffield is informally known as "the largest village in England ", because of a combination of topographical isolation and demographic stability. It is relatively geographically isolated, being cut off from other places by a ring of hills. Local folklore insists that, like Rome, Sheffield was built "on seven hills". The land surrounding Sheffield
24168-527: Was built on the site of Walk Mill in 1872. The river shares its valley with the railway, and there are a further five crossings before both reach Sheffield station . From the junction of the Redcar Brook and the Old Hay Brook to the city centre, the river descends by around 400 feet (120 m), and this fall has resulted in it being harnessed to provide water power for a number of industries from at least
24327-404: Was given before the release of the independent inquiry's report on the so-called "Sheffield Chainsaw Massacre". The report concluded that "thousands of healthy and loved trees were lost. Many more could have been" and was critical of Sheffield City Council. The latter issued this statement on receipt of the report: "the council has already acknowledged that it got many things wrong in the handling of
24486-509: Was occupied by Thomas Tyzack and Sons, who made saws. The site was sold to the Midland Railway by the Duke of Devonshire in 1871 to enable the construction of Dore and Totley station, and the last mill buildings were taken down in 1890. Below Walk Mill, the Limb Brook flows in from the west. Whirlow Wheel was situated on the brook, and was used for milling corn between about 1586 until 1803, when
24645-461: Was particularly hard hit during the 2007 United Kingdom floods and the 2010 'Big Freeze' . Many landmark buildings such as Meadowhall and the Hillsborough Stadium flooded due to being close to rivers that flow through the city. In 2010, 5,000 properties in Sheffield were identified as still being at risk of flooding. In 2012 the city narrowly escaped another flood, despite extensive work by
24804-475: Was probably built by the Midland Railway, as its orientation changed around that time. From Granville Square to the Don, the river is almost entirely in culverts. The Midland Railway bought the water rights to allow them to build their station over the river. The site of Pond Tilt is now occupied by the station forecourt, and the goods yard covered its dam. The owners of Pond Forge vacated their site soon after
24963-537: Was recorded as a daytime maximum at Weston Park, on 20 December 2010 (from the Weston Park Weather Station statistics, which also can be viewed at Sheffield Central Library.) On average, through the winter months of December to March, there are 67 days during which ground frost occurs. The Weston Park Weather station, established in 1882, is one of the longest running weather stations in the United Kingdom. It has recorded weather for more than 125 years, and
25122-400: Was unsuitable for industrial use, and now includes several protected green belt areas. These topographical factors have served to restrict urban spread, resulting in a relatively stable population size and a low degree of mobility. After many years of decline, the Sheffield economy is going through a strong revival. The 2004 Barclays Bank Financial Planning study revealed that, in 2003,
25281-522: Was used to make sling bullets from the 5th century BC. In Roman times, lead sling bullets were amply used, and were effective at a distance of between 100 and 150 meters. The Balearic slingers , used as mercenaries in Carthaginian and Roman armies, were famous for their shooting distance and accuracy. Lead was used for making water pipes in the Roman Empire ; the Latin word for the metal, plumbum ,
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