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< Back Bromine  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 35 Atomic Symbol Br Atomic Weight 79.904 amu Group Halogen, 17 Form Liquid Density @ STP 3.1028 g/cm3 Melting Point -7.2 °C (19.04 °F, 265.95 °K) Boiling Point 58.8 °C (137.84 °F, 331.95 °K) Heat of Fusion 10.57 kJ/mol Heat of Vaporization 29.96 kJ/mol First Ionization Potential 11.81381 eV Electronegativity (on Pauling scale) 2.96 Specific Heat Capacity 0.226 J/g K Ground State Electron Configuration 4p5 Oxidation States +1, +5, -1 Stable Isotopes and Natural Abundance on Earth 79Br, 50.69%; 81Br, 49.31% Selected Radioisotopes 75Br, 77Br, 82Br Atomic Radius 94 pm Crystal Structure Orthorhombic Discovered by Balard, 1826

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