Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Iridium | |
| Electron Configuration | 2,8,18,32,15,2 |
| Electron Configuration | [Xe]] 4f14 5d7 6s2 |
| Electronegativity | 2.20 |
| Enthalpy of Fusion | 26.4 kJ mol-1 |
| Enthalpy of Vaporisation | 612.1 kJ mol-1 |
| Heat Capacity | 25.10 J mol-1 K-1 |
| Thermal Conductivity | 147 W m-1 K-1 |
| Thermal Expansion | 6.4 μm m-1 K-1 |
| Magnetic ordering | No data |
| Electrical resistivity | 47.1 Ω m |
| Speed of sound | 4825 m s-1 |
| Young's modulus | 528 GPa |
| Shear modulus | 4825 GPa |
| Bulk modulus | 320 GPa |
| Poisson ratio | 0.26 |
| Mohs hardness | 6.5 |
| Vickers hardness | 1760 MPa |
| Brinell hardness | 1670 MPa |
| Atomic Radii |
|
| Atomic Radius
|
135 pm |
| Bohr Radius
|
180 pm |
| Covalent Radius
|
137 pm |
| Van der Waals
|
0 pm |
| Oxidation States |
|
| Main
|
Ir+3, Ir+4 |
| Other
|
Ir-1, Ir0, Ir+1, Ir+2, Ir+5, Ir+6 |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
880 |
| M+ - M2+ |
1680 |
| M2+ - M3+ |
2600 |
| M3+ - M4+ |
3800 |
| M4+ - M5+ |
5500 |
| M5+ - M6+ |
6900 |
| M6+ - M7+ |
8500 |
| M7+ - M8+ |
10000 |
| M8+ - M9+ |
11700 |