Osmium (Os) — Atomic Data, Electron Shells & Reactions

Atomic Number (Z) 76 IUPAC Symbol Os Standard Atomic Weight 190.23 g/mol Period / Group / Block 6 / 8 / d-block Condensed Electron Config [Xe] 4f14 5d6 6s2 Full Subshell Config 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d6 6s2 Principal Shell Occupancy [2, 8, 18, 32, 14, 2] Pauling Electronegativity 2.2 First Ionization Energy 840 kJ/mol Covalent Radius 144 pm Melting Point 3306 K (3032.85 °C) Boiling Point 5285 K (5011.85 °C) Density 22.59 g/cm³ Oxidation States +4, +8