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< Back Silicon  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 14 Atomic Symbol Si Atomic Weight 28.0855 amu Group Metalloid, 14 Form Solid Density @ STP 2.3290 g/cm3 Melting Point 1414 °C (2577.2 °F, 1687.2 °K) Boiling Point 3265 °C (5909 °F, 3538.2 °K) Heat of Fusion 50.21 kJ/mol Heat of Vaporization 359 kJ/mol First Ionization Potential 8.15169 eV Electronegativity (on Pauling scale) 1.91 Specific Heat Capacity 0.705 J/g K Ground State Electron Configuration 3p2 Oxidation States +2, +4, -4 Stable Isotopes and Natural Abundance on Earth 28Si, 92.23%; 29Si, 4.67%; 30Si, 3.10% Selected Radioisotopes 32Si Atomic Radius 111 pm Crystal Structure Diamond Discovered by Berzelius, 1824

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