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< Back Sulfur  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 16 Atomic Symbol S Atomic Weight 32.066 amu Group Non-Metal, 16 Form Solid Density @ STP 2.07 g/cm3 Melting Point 115.21°C (239.38 °F, 388.36 °K) Boiling Point 444.60 °C (832.28 °F, 717.75 °K) Heat of Fusion 1.72 kJ/mol Heat of Vaporization 45 kJ/mol First Ionization Potential 10.36001 eV Electronegativity (on Pauling scale) 2.58 Specific Heat Capacity 0.710 J/g K Ground State Electron Configuration 3p4 Oxidation States +4, +6, -2 Stable Isotopes and Natural Abundance on Earth 32S, 95.02%;33P, 0.75%; 34S, 4.21%; 36S, 0.02% Selected Radioisotopes 35S Atomic Radius 88 pm Crystal Structure Orthorhombic Discovered by Lavoisier, 1777

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