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< Back Magnesium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 12 Atomic Symbol Mg Atomic Weight 24.305 amu Group Alkaline Earth, 2 Form Solid Density @ STP 1.74 g/cm3 Melting Point 650 °C (1202 °F, 923.2 °K) Boiling Point 1090 °C (1994 °F,1363.2 °K) Heat of Fusion 8.48 kJ/mol Heat of Vaporization 128 kJ/mol First Ionization Potential 7.64624 eV Electronegativity (on Pauling scale) 1.31 Specific Heat Capacity 1.023 J/g K Ground State Electron Configuration 3s2 Oxidation States +2 Stable Isotopes and Natural Abundance on Earth 24Mg, 78.99%; 25Mg, 10.00%; 26Mg, 11.01% Atomic Radius 145 pm Crystal Structure Hexagonal Discovered by Black, 1755

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