Iridium |
| Symbol | Ir |
|---|---|
| Latin name | Iridium |
| Atomic number | 77 |
| Period | 6 |
| Element category | Transition elements |
| Relative atomic mass | 192.22 |
| Group | VIII.B |
| Electronegativity | 2.2 |
| Oxidation numbers | 2, 3, 4, 6 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d7 6s2 |
| Density [g/cm3] | 22.5 |
| State | Solid |
| Melting point [°C] | 2447 |
| Boiling point [°C] | 4500 |
| Atomic radius [pm] | 180 |
| Covalent radius [pm] | 137 |
| Thermal conductivity [W m-1K-1] | 147 |
| Heat capacity [J K-1g-1] | 0.13 |
| Discovery | 1803 |
| Hardness [Mohs scale] | 6.5 |
| Vickers hardness [MPa] | 1760 |
| Brinell hardness [MPa] | 1670 |
| Young's modulus [GPa] | 528 |
| Electrical conductivity [S m-1] | 2.1 · 107 |
| Shear modulus [GPa] | 210 |
| 1.st ionization energy [eV] | 9.1 |
| Stable isotopes | 2 |
| Unstable isotopes | 23 |