Ir
Iridium (Atomic Number 77)
Category: transition | Period 6, Group 9 | Block: d
Most corrosion-resistant metal known; asteroid impact marker.
Atomic & Physical Constants
- Standard Atomic Weight:
- 192.2173 u
- Standard State Phase:
- Solid
- Electron Configuration:
- 2, 8, 18, 32, 15, 2
- Electronegativity (Pauling):
- 2.2
- Melting Point:
- 2719 K
- Boiling Point:
- 4403 K
Historical Discovery & Real-World Applications
Industrial & Scientific Uses
High-temperature spark plugs, iridium crucibles, OLED displays
Discovery History
Discovered by Smithson Tennant (1804).
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