Osmium

Transition metal · 190.2 u · group 8, period 6

Osmium · Os

Atomic number76

SymbolOs

CategoryTransition metal

Standard stateSolid

Group · Period · Block8 · 6 · d

Electron configuration[Xe]6s2 4f14 5d6

Atomic mass190.2 u

Atomic radius216 pm

Protons / Neutrons / Electrons76 / 114 / 76

Shells (e⁻ per shell)2, 8, 18, 32, 14, 2

Electronegativity (Pauling)2.2

Ionization energy8.7 eV

Electron affinity1.1 eV

Oxidation states+4, +3

Melting point3.31e+3 K · 3.03e+3 °C

Boiling point5.29e+3 K · 5.01e+3 °C

Density22.57 g/cm³

Year discovered1803

CPK color

#266696

State at room temp (25 °C)

solid

Position

1 in library