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< Back Iodine  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 53 Atomic Symbol I Atomic Weight 126.90447 amu Group Halogen, 17 Form Solid Density @ STP 4.933 g/cm3 Melting Point 113.7 °C (236.66 °F, 386.85 °K) Boiling Point 184.4 °C (363.92 °F, 457.55 °K) Heat of Fusion 15.52 kJ/mol Heat of Vaporization 41.57 kJ/mol First Ionization Potential 10.45126 eV Electronegativity (on Pauling scale) 2.66 Specific Heat Capacity 0.145 J/g K Ground State Electron Configuration 5p5 Oxidation States +1, +5, +7, -1 Stable Isotopes and Natural Abundance on Earth 127I, 100% Selected Radioisotopes 122I, 123I, 124I, 125I, 129I, 131I, 132I Atomic Radius 115 pm Crystal Structure Orthorhombic Discovered by Courtois, 1811

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