Osmium is a chemical element with the symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum family and is the densest naturally occurring element, with a density of 22.59 g/cm³.Symbol: Os
Electron configuration: Xe 4f14 5d6 6s2
Melting point: 3,027 °C
Atomic number: 76
Discovered: 1804
Atomic mass: 190.23 ± 0.03 u