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 |