Osmium

Symbol | Os
Latin name | Osmium
Atomic number | 76
Period | 6
Element category | Transition elements
Relative atomic mass | 190.2
Group | VIII.B
Electronegativity | 2.2
Oxidation numbers | 2, 3, 4, 6, 8
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d6 6s2
Density [g/cm3] | 22.6
State | Solid
Melting point [°C] | 3045
Boiling point [°C] | 5000
Atomic radius [pm] | 185
Covalent radius [pm] | 128
Thermal conductivity [W m-1K-1] | 87.6
Heat capacity [J K-1g-1] | 0.13
Discovery | 1803
Hardness [Mohs scale] | 8.0
Brinell hardness [MPa] | 3920
Electrical conductivity [S m-1] | 1.23 · 107
Shear modulus [GPa] | 222
1.st ionization energy [eV] | 8.7
Stable isotopes | 7
Unstable isotopes | 12