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< Back Platinum  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 78 Atomic Symbol Pt Atomic Weight 195.08 amu Group Transition, 10 Form Solid Density @ STP 21.5 g/cm3 Melting Point 1768.4 °C (3215.12 °F, 2041.55 °K) Boiling Point 3825 °C (6917 °F, 4098.15 °K) Heat of Fusion 22.17 kJ/mol Heat of Vaporization 490 kJ/mol First Ionization Potential 9.0 eV Electronegativity (on Pauling scale) 2.2 Specific Heat Capacity 0.133 J/g K Ground State Electron Configuration 5d9 6s1 Oxidation States +2, +4 Stable Isotopes and Natural Abundance on Earth 190Pt, 0.01%; 192Pt, 0.79%; 194Pt, 32.9%; 195Pt, 33.8%; 196Pt, 25.3%; 198Pt, 7.2% Atomic Radius 177 pm Crystal Structure Cubic

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