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1992-09-23
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416b
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15 lines
IRIDIUM
Atomic symbol - Ir
Atomic weight - 192.22
Atomic number - 77
Electron configuration - 2-8-18-32-15-2
Oxidation states - +3, +4
State of matter - solid
Heavy metal-ductile
Discovered in 1804 by Smithson Tennant
Boils at 4527 °C, melts at 2410 °C
Notes:
Very dense and rare, iridium has a silvery-white color. Its main use is in the
form of platinum alloys.