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