| Iridium | |
| Electrons per shell | 2,8,18,32,15,2 |
| Electron Configuration | [Xe] 4f14 5d7 6s2 ![]() |
| Ground state | 4F9/2 |
| Atomic Volume | 8.54 cm3 mol-1 |
| Electronegativity | 2.20 |
| Magnetic ordering | No data |
| Mass magnetic susceptibility | 2.3 x 10-9 |
| Molar magnetic susceptibility | 4.42 x 10-10 |
| Speed of sound | 4825 m s-1 |
Thermal Properties |
|
| Enthalpy of Atomization | 628 kJ mol-1 @25°C |
| 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 |
| Critcal Temperature | No data. |
| Critcal Pressure | No data. |
| Adiabatic index | No data. |
Hardness |
|
| Brinell hardness | 1670 MPa |
| Mohs hardness | 6.5 |
| Vickers hardness | 1760 MPa |
Elastic Properties |
|
| Bulk modulus | 320 GPa |
| Poisson ratio | 0.26 |
| Shear modulus | 210 GPa |
| Young's modulus | 528 GPa |
Electrical Properties |
|
| Electrical resistivity | 4.7 x 10-8 Ω m |
| Electrical conductivity | 0.197 106/cm Ω |
Chemical Properties |
|
| Electrochemical Equivalent | 1.793 g Ah-1 |
| Electron Work Function | 5.27 eV |
| Valence Electron Potential (-eV) | 92.2 |
| Ionization Potential | |
| 9.1 | |
Energy Levels |
|
| 64.8956 KeV | |
| 63.2867 KeV | |
| 73.5608 KeV | |
| 74.0996 KeV | |
| 73.5896 KeV | |
| 9.1751 KeV | |
| 9.0995 KeV | |
| 10.7083 KeV | |
| 10.9203 KeV | |
| 10.8653 KeV | |
| 10.5094 KeV | |
| 12.5126 KeV | |
| 12.8383 KeV | |
| 9.647 KeV | |
| 8.0423 KeV | |
Atomic Radii |
|
| 135 pm | |
| 180 pm | |
| 137 pm | |
| No data. | |
| 107 pm | |
| 135.5 pm | |
Oxidation States |
|
| Ir+3, Ir+4 | |
| Ir-1, Ir0, Ir+1, Ir+2, Ir+5, Ir+6 | |
Ionisation Energies (kJ mol-1) ![]() |
|
| 880 | |
| 1680 | |
| 2600 | |
| 3800 | |
| 5500 | |
| 6900 | |
| 8500 | |
| 10000 | |
| 11700 | |
Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 2713 | 2957 | 3252 | 3614 | 4069 | 4659 |
Crystal Structure |
|
| Cubic close packed | |
![]() |
a = 383.9 pm |
| b = 383.9 pm | |
| c = 383.9 pm | |
| α = 90° | |
| β = 90° | |
| γ = 90° | |