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Os - Osmium

Osmium

 Osmium 
Os
Atomic Number: 76
Atomic Weight: 190.23
Element Type: Transition Metal
Crystal Structure: Hexagonal
Melting Point: 3033.0°C = 5491.4°F = 3306.15 K
Boiling Point: 5012.0°C = 9053.6°F = 5285.15 K
Critical Temp: °C = °F = K
Atomic Radius: 1.92 Å (Å = Angstrom = 10-10 m)
Covalent Radius: 1.26 Å
Electronegativity: 2.2

History

(Gr. osme, a smell) Discovered in 1803 by Tennant in the residue left when crudeplatinum is dissolved by aqua regia.


Sources

Osmium occurs in iridosule and in platinum-bearing river sands of the Urals, NorthAmerica, and South America. It is also found in the nickel-bearing ores of Sudbury,Ontario region along with other platinum metals. While the quantity of platinum metals inthese ores is very small, the large tonnages of nickel ores processed make commercialrecovery possible.






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