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< Back Uranium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 92 Atomic Symbol U Atomic Weight 238.0289 amu Group Rare Earth (Actinide Series) Form Solid Density @ STP 19.1 g/cm3 Melting Point 1135 °C 2075 °F, 1408.15 °K) Boiling Point 3926 °C (7098.8 °F, 4199.15 °K) Heat of Fusion 9.14 kJ/mol Heat of Vaporization 420 kJ/mol First Ionization Potential 6.19405 eV Electronegativity (on Pauling scale) 1.7 Specific Heat Capacity 0.116 J/g K Ground State Electron Configuration 5f3 6s2 6p6 6d1 6f2 Oxidation States +3, +4, +5, +6 Stable Isotopes and Natural Abundance on Earth 234U, 0.0055%; 235U, 0.7200%; 238U, 99.2745% Selected Radioisotopes 234U, 235U, 238U Crystal Structure Orthorhombic Discovered by Klaproth, 1789

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