| Ir | Iridium | Transition Metal |
| Atomic number: | 77 | Atomic weight: | 192.22 | ||
| Shells: | 2,8,18,32,15,2 | Orbitals: | [Xe] 4f14 5d7 6s2 | ||
| Melting point: | 2410°C | Boiling point: | 4130°C | ||
| Covalent radius: | 1.27 | Å | Atomic volume: | 8.54 | cm³/mol |
| Atomic radius: | 1.87 | Å | Ionic radius: | .63 (+4) | Å |
| Electronegativity: | 2.20 | Oxidation states: | 2,3,(4),6 | ||
| 1st ionization pot.: | 9.1 | V | 2nd ionization pot.: | -- | V |
| 3rd ionization pot.: | -- | V | Specific heat: | 0.130 | J/gK |
| Heat of fusion: | 26.10 | kJ/mol | Heat of vapor.: | 604.0 | kJ/mol |
| Thermal conduct.: | 1.47 | W/cmK | Electrical conduct.: | 0.197 | 10^6/cm ohm |
| Density: | 22.42 | g/cm³ | Valence: | 3 |