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< Back Osmium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 76 Atomic Symbol Os Atomic Weight 190.23 amu Group Transition, 8 Form Solid Density @ STP 22.59 g/cm3 Melting Point 3033 °C (5491.4 °F, 3306.15 °K) Boiling Point 5012 °C (9053.6 °F, 5285.15 °K) Heat of Fusion 57.85 kJ/mol Heat of Vaporization 630 kJ/mol First Ionization Potential 8.7 eV Electronegativity (on Pauling scale) 2.2 Specific Heat Capacity 0.130 J/g K Ground State Electron Configuration 5d6 6s2 Oxidation States +3, +4 Stable Isotopes and Natural Abundance on Earth 184Os, 0.02%; 186Os, 1.58%; 187Os, 1.6%; 188Os, 13.3%; 189Os, 16.1%; 190Os, 26.4%; 192Os, 41.0% Selected Radioisotopes 191Os, 194Os Atomic Radius 185 pm Crystal Structure Hexagonal Discovered by Tennant, 1803

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