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< Back Copper  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 29 Atomic Symbol Cu Atomic Weight 63.546 amu Group Transition, 11 Form Solid Density @ STP 8.96 g/cm3 Melting Point 1084.62 °C (1984.32 °F, 1357.77 °K) Boiling Point 2562 °C (4643.6 °F, 2835.2 °K) Heat of Fusion 13.26 kJ/mol Heat of Vaporization 300 kJ/mol First Ionization Potential 7.72638 eV Electronegativity (on Pauling scale) 1.90 Specific Heat Capacity 0.385 J/g K Ground State Electron Configuration 3d10 4s1 Oxidation States +1, +2 Stable Isotopes and Natural Abundance on Earth 63Cu, 69.17%; 65Cu, 30.83% Selected Radioisotopes 61Cu, 62Cu, 64Cu, 67Cu Atomic Radius 145 pm Crystal Structure Cubic

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