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< Back Zinc  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 30 Atomic Symbol Zn Atomic Weight 65.39 amu Group Transition, 12 Form Solid Density @ STP 7.14 g/cm3 Melting Point 419.53 °C (787.15 °F, 692.68 °K) Boiling Point 907 °C (1664.6 °F, 1180.2°K) Heat of Fusion 7.32 kJ/mol Heat of Vaporization 119 kJ/mol First Ionization Potential 9.39405 eV Electronegativity (on Pauling scale) 1.65 Specific Heat Capacity 0.388 J/g K Ground State Electron Configuration 3d10 4s2 Oxidation States +2 Stable Isotopes and Natural Abundance on Earth 64Zn, 48.6%; 66Zn, 27.9%; 67Zn, 4.1%; 68Zn, 18.4%; 70Zn, 0.6% Selected Radioisotopes 62Zn, 65Zn Atomic Radius 142 pm Crystal Structure Hexagonal Discovered by Marggraf, 1500

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