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85-457: The headquarters of the Shawnee Tribe is Miami, Oklahoma . Currently, there are about 2,226 enrolled tribal members, with 1,070 of them living within the state of Oklahoma. Ben Barnes is the current elected Chief. Previously, Ron Sparkman was the elected chairman, serving a four-year term. The Shawnee Tribe issues its own tribal vehicle tags. They operate their own housing authority as well as

170-433: 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

255-457: 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

340-492: 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

425-662: A mascot by any other school in the United States. A portion of northern Miami is within the Commerce Public Schools school district. Northeastern Oklahoma A&M College was accredited initially in 1925 by the North Central Association of Colleges and Schools . In addition to its certificate programs, it has working relationships with other higher education institutions in the state to promote transfers of students seeking four-year college degrees. In 2015

510-558: 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

595-466: 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

680-437: 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

765-438: 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

850-579: A state, and the White people of Kansas demanded that all Indian tribes must be removed from the state. The Loyal Shawnee made an agreement with the Cherokee Nation in 1869, allowing 722 to gain citizenship within the Cherokee tribe and receive allotments of Cherokee land. They predominantly settled in what is now Craig and Rogers County, Oklahoma . They became known as the "Cherokee Shawnee," primarily settling in

935-449: 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

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1020-578: A tribal smoke shop, the Shawnee Trails Gift Shop and Gallery, Shawnee Development LLC, and Shawnee Heritage Government Solutions. Their annual economic impact is estimated by the Oklahoma Indian Affairs Commissions to be $ 3 million. Shawnee Development LLC is an economic development corporation established in 2001, owned by the tribe but conducting business separately from the general government functions. The Shawnee Journal

1105-590: 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

1190-516: 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

1275-401: 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

1360-420: 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

1445-775: 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

1530-669: Is a newspaper published by the tribe and distributed at no cost to all tribal members. Some traditional ceremonies, such as the Spring and Fall Bread Dance, the Green Corn ceremony , and stomp dances are still held. These take place in White Oak, Oklahoma . Some Shawnees are also members of the Native American Church peyote ceremonies, with most attending in the winter outside of the traditional Shawnee ceremonial cycle. The Shawnee Tribe

1615-426: 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,

1700-404: 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

1785-667: Is an Eastern Woodland tribe . They originally came from Ohio and Pennsylvania, and were the last of the Shawnee to leave their traditional homelands there. In the late 18th century, European American encroachment crowded Shawnee lands in the East, and one band migrated to Missouri — eventually becoming the Absentee Shawnee. Three reservations were granted to the Shawnee in Ohio by the 1817 Treaty of Fort Meigs : Wapakoneta, Lewistown, and Hog Creek. After

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1870-561: Is available from Joplin Regional Airport, about 34 miles (55 km) northeast, or Tulsa International Airport, about 85 miles (137 km) southwest. Miami and Ottawa County, together with nearby Delaware County, Oklahoma to the south, attract numerous tourists to the state. These counties combined make up the third-largest tourism destination in the state, following only the Oklahoma City and Tulsa metropolitan areas. Miami

1955-445: 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

2040-408: 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

2125-414: 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

2210-710: Is home to the historic Coleman Theatre, located at 103 N. Main St. On April 18, 1929, the 1,600-seat Coleman Theatre enjoyed a grand opening as a luxurious movie theater of the time. Designed by the Boller Bros. , and built by George L. Coleman Sr. at a cost of $ 600,000, the Louis XV interior includes gold leaf trim, silk damask panels, stained glass panels, marble accents, a carved mahogany staircase, Wurlitzer pipe organ, decorative plaster moldings, and bronze railings. While there have been many changes to seeing movies in grand theaters,

2295-502: 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

2380-677: Is named; the Modoc Tribe of Oklahoma , Ottawa Tribe of Oklahoma, Peoria Tribe of Indians , and Shawnee Tribe . According to the United States Census Bureau , the city has a total area of 9.8 square miles (25 km ), of which 0.1 square miles (0.26 km ) (0.82%) is covered by water. Miami is located on the Neosho River , and was severely affected by the Great Flood of 1951 . The town has flooded more than two dozen times since

2465-650: 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

2550-499: Is on Interstate 44 and U.S. Route 69 , and is approximately two miles (3.2 km) from U.S. Route 59 . Pelivan Transit, owned and operated by Grand Gateway EDA & Northeast Oklahoma Tribal Transit Consortium, provides a trolley loop in Miami, as well as certain on-demand bus services. Miami is served by Miami Regional Airport (KMIO; FAA Identifier MIO), with a 5,020-foot (1,530 m) paved runway. Commercial air transportation

2635-741: 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

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2720-415: 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

2805-413: 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

2890-448: 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

2975-529: 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

3060-525: 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,

3145-446: 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

3230-531: The Encyclopedia of Oklahoma History and Culture "... it was settled in a business-like way by men of vision who looked into the future and saw possibilities. It didn't just grow. It was carefully planned." W. C. Lykins petitioned the U.S. Congress to pass legislation on March 3, 1891, to establish the town. He met with Thomas F. Richardville, chief of the Miami Tribe of Oklahoma , who agreed to meet in turn with

3315-679: The Indian Removal Act of 1830 passed, another Shawnee band, which would become the Eastern Shawnee Tribe relocated to Indian Territory in July 1831. The final band, who would become the Shawnee Tribe, relocated to Kansas in August 1831. Their Kansas lands were drastically reduced in 1854 and broken up into individual allotments in 1858. During the Civil War many of the Shawnee Tribe fought for

3400-608: 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,

3485-659: 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,

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3570-757: The U.S. Indian Commission and the Ottawa Tribe . That meeting resulted in Congress authorizing the secretary of the United States Department of the Interior to approve the townsite purchase from the Ottawa. Lykins, Richardville and Manford Pooler, chief of the Ottawa, are identified in historical accounts as "fathers of Miami." Lykins' company, the Miami Town Company, bought 588 acres (238 ha) of land from

3655-795: 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

3740-401: 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

3825-619: 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

3910-468: 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

3995-444: The 1990s, most recently during the 2019 Arkansas River floods . Town residents and neighboring Native American groups have objected to maintaining high water levels on the river at Pensacola Dam and its popular vacation area, Grand Lake , on the grounds that when water backs up downstream, it can increase Miami's flooding problems. As of the 2010 census, there were 13,570 people, 5,315 households, and 3,337 families residing in

4080-606: 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

4165-791: The National Register of Historical Places, including the George L. Coleman Sr. House , the Miami Marathon Oil Company Service Station , and the Miami Downtown Historic District . Public schools serving most of Miami are managed by the Miami Public Schools school district. The high school is Miami High School, whose mascot is the Wardog. The Wardog is a mascot unique to Miami and has not been adopted as

4250-425: The Ottawa for ten dollars an acre. On June 25–26, 1891 they held an auction of lots. In 1895, Miami incorporated and had more than 800 residents. The discovery of rich deposits of lead and zinc under Quapaw land a few miles north caused Miami to boom. In 1907, at the time of statehood, its population was 1,893. As mining increased and more mills were built, the population more than tripled to 6,802 by 1920. Miami

4335-471: 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

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4420-643: The Shawnee Tribe Status Act of 2000, and the Shawnee Tribe was able to organize as their own autonomous, federally recognized tribe. James R. Squirrel was the initial Chairman and was recognized by the AARP in 2009, as being instrumental in the Shawnee Tribe being federally recognized. Miami, Oklahoma Miami ( / m aɪ ˈ æ m ə / my- AM -ə ) is a city in and the county seat of Ottawa County, Oklahoma , United States, founded in 1891. Lead and zinc mining were established by 1918, causing

4505-489: The Union, which inspired the name, "Loyal Shawnee." Instead of receiving compensation or honors for their service, they returned to their Kansas lands, only to find much of it taken over by non-Indian homesteaders . Settlers were granted 130,000 acres (530 km) of Shawnee land, while 70,000 acres (280 km) remained to for the tribe, of which 20,000 acres (81 km) were granted to the Absentee Shawnee. In 1861 Kansas became

4590-405: The age of 18 living with them, 44.6% were married couples living together, 15% had a female householder with no husband present, and 36.2% were non-families. Single individuals living alone accounted for 31.9% of households and individuals 65 years of age or older living alone accounted for 14.7% of households. The average household size was 2.46 and the average family size was 3.07. In the city,

4675-616: The area's economy to boom. This area was part of Indian Territory . Miami is the capital of the federally recognized Miami Tribe of Oklahoma , after which it is named; the Modoc Tribe of Oklahoma , the Ottawa Tribe of Oklahoma , the Peoria Tribe of Indians , and the Shawnee Tribe . As of the 2020 census , the population was 12,969. The city was founded in an unusual way, compared to other towns established in Indian Territory . Per

4760-511: The areas of Bird Creek (now known as Sperry ); Hudson Creek (now known as Fairland ); and White Oak . The Shawnee Reservation in Kansas was never legally dissolved and some Shawnee families still hold their allotment lands in Kansas. Beginning in the 1980s, the Shawnee Tribe began an effort to regain their own tribal status, independent of the Cherokee Nation. Congress passed Public Law 106-568,

4845-600: 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

4930-643: The building has been preserved and also serves as a venue for live performances. In 1959 a local non-profit community group established the Miami Little Theatre. The community theater group presents five large-scale productions on the Coleman stage every year. In 1983, the Coleman Theatre was placed on the National Register of Historical Places for Ottawa County . Other Miami structures are also listed on

5015-472: The city. a one percent decline from 13,704 at the 2000 census. The population density was 1,258.7 inhabitants per square mile (486.0/km ). The racial makeup of the city was 68.9% white , 1.3% African American , 17.1% Native American , 0.5% Asian , 2% Pacific Islander , 2.1% from other races , and 8% from two or more races. Hispanic or Latino of any race made up 4.8% of the population. There were 5,315 households, out of which 31.9% had children under

5100-485: 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 ,

5185-419: 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

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5270-428: 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

5355-515: 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,

5440-566: 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

5525-413: 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;

5610-430: 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

5695-446: 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

5780-447: 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

5865-560: 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

5950-441: 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

6035-533: 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

6120-423: The population was spread out, with 24.7% under the age of 18, 57.1% from 18 to 64, and 18.2% who were 65 years of age or older. The median age was 35.8 years. The population was 53.2% female and 46.8% male. The median income for a household in the city was $ 34,561, and the median income for a family was $ 42,313. Males had a median income of $ 32,699 versus $ 25,320 for females. About 14.2% of families and 19.2% of

6205-666: The population were below the poverty line. In 2020, about one in four residents lived in poverty. Local government in Miami consists of an elected Mayor at-large and four councilmen representing four Wards. As of 2023, the city is represented in the Oklahoma House of Representatives by Republican Steve Bashore , and in the Oklahoma Senate by Republican Micheal Bergstrom . The city lies within Oklahoma's 2nd congressional district , represented by Josh Brecheen since 2023. Miami

6290-418: 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

6375-414: 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),

6460-422: 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

6545-432: 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,

6630-541: 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

6715-507: 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

6800-491: 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

6885-588: 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

6970-424: The two-year community college had about 2,000 students. 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 a relatively low melting point . When freshly cut, lead is a shiny gray with a hint of blue. It tarnishes to

7055-403: 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

7140-674: Was on the route of the Jefferson Highway established in 1915, with that international road running more than 2,300 miles (3,700 km) from Winnipeg , Manitoba in Canada across the border and to New Orleans , Louisiana. US Route 66 in Oklahoma also passed through Miami. An historic section of the Route 66 roadbed is marked in Miami. It is the capital of the Miami Tribe of Oklahoma, after which it

7225-522: 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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