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< Back Germanium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 32 Atomic Symbol Ge Atomic Weight 72.61 amu Group Metalloid, 14 Form Solid Density @ STP 5.3234 g/cm3 Melting Point 938.25 °C (1720.85 °F, 1211.4 °K) Boiling Point 2833 °C (5131.4 °F, 3106.15 °K) Heat of Fusion 36.94 kJ/mol Heat of Vaporization 334 kJ/mol First Ionization Potential 7.900 eV Electronegativity (on Pauling scale) 2.01 Specific Heat Capacity 0.320 J/g K Ground State Electron Configuration 4p2 Oxidation States +2, +4 Stable Isotopes and Natural Abundance on Earth 70Ge, 21.23%; 72Ge, 27.66%; 73Ge, 7.73%; 74Ge, 35.94%; 76Ge, 7.74% Selected Radioisotopes 68Ge Atomic Radius 125 pm Crystal Structure Cubic Discovered by Winkler, 1886

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