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< Back Nickel  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 28 Atomic Symbol Ni Atomic Weight 58.6934 amu Group Transition, 10 Form Solid Density @ STP 8.90 g/cm3 Melting Point 1445 °C (2633 °F, 1718.2 °K) Boiling Point 2913 °C (5275.4 °F, 3186.2 °K) Heat of Fusion 17.48 kJ/mol Heat of Vaporization 378 kJ/mol First Ionization Potential 7.6398 eV Electronegativity (on Pauling scale) 1.91 Specific Heat Capacity 0.444 J/g K Ground State Electron Configuration 3d8 4s2 Oxidation States +2, +3 Stable Isotopes and Natural Abundance on Earth 58Ni, 68.077%; 60Ni, 26.223%; 61Ni, 1.140%; 62Ni, 3.634%; 64Ni, 0.926% Selected Radioisotopes 59Ni, 63Ni, 66Ni Atomic Radius 149 pm Crystal Structure Cubic Discovered by Cronstedt, 1751

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