Iridium
Iridium is a chemical element that has the symbol Ir and atomic number 77. A dense, very hard, brittle, silvery-white transition metal of the platinum family, iridium is used in high-strength alloys that can withstand high temperatures and occurs in natural alloys with platinum or osmium. Iridium is notable for being the most corrosion-resistant element known and for its significance in the determination of the probable cause of the extinction, by a meteorite strike, of the dinosaurs. It is used in high-temperature apparatuses, electrical contacts, and as a hardening agent for platinum.
| General | |
|---|---|
| Atomic number: | 77 |
| Symbol: | Ir |
| Atomic weight: | 192.22 |
| Boiling Point (C): | |
| Melting Point (C): | |
| Density: | |
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