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< Back Antimony  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 51 Atomic Symbol Sb Atomic Weight 121.760 amu Group Metalloid, 15 Form Solid Density @ STP 6.68 g/cm3 Melting Point 630.63 °C (1167.134 °F, 903.78 °K) Boiling Point 1587 °C (2888.6 °F, 1860.15 °K) Heat of Fusion 19.87 kJ/mol Heat of Vaporization 68 kJ/mol First Ionization Potential 8.64 eV Electronegativity (on Pauling scale) 2.05 Specific Heat Capacity 0.207 J/g K Ground State Electron Configuration 5p3 Oxidation States +3, +5, -3 Stable Isotopes and Natural Abundance on Earth 121Sb, 57.36%; 123Sb, 42.64% Atomic Radius 133 pm Crystal Structure Trigonal

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