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Iridium (Ir)
Atomic number 77 · transition
| Atomic number | 77 |
|---|---|
| Atomic mass | 192.217 u |
| Molar mass | 192.217 g/mol |
| Category | transition |
| Group / period / block | 9 / 6 / d |
| Electron configuration | [Xe] 4f14 5d7 6s2 |
| Electrons per shell | 2, 8, 18, 32, 15, 2 |
| Electronegativity (Pauling) | 2.2 |
| Atomic radius | 135.0 pm |
| Density | 22.5622 g/cm³ |
| First ionisation energy | 8.967 eV |
| Melting point | 2719.15 K (2446.00 °C) |
| Boiling point | 4701.15 K (4428.00 °C) |
| Common oxidation states | +3, +4 |
| Abundance in Earth's crust | 0.001 ppm |
Uses
Spark plugs, crucibles
Discovery
1804, S.Tenant, A.F.Fourcory, L.N.Vauquelin, H.V.Collet-Descoltils