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< Back Samarium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 62 Atomic Symbol Sm Atomic Weight 150.36 amu Group Rare Earth (Lanthanide Series) Form Solid Density @ STP 7.42 g/cm3 Melting Point 1074 °C (1965.2 °F, 1347.15 °K) Boiling Point 1794 °C (3261.2 °F, 2067.15 °K) Heat of Fusion 8.62 kJ/mol Heat of Vaporization 175 kJ/mol First Ionization Potential 5.6437 eV Electronegativity (on Pauling scale) 1.17 Specific Heat Capacity 0.197 J/g K Ground State Electron Configuration 4f6 5s2 5p6 6s2 Oxidation States +2, +3 Stable Isotopes and Natural Abundance on Earth 144Sm, 3.1%; 147Sm, 15.2%; 148Sm, 11.3%; 149Sm, 13.8%; 150Sm, 7.4%; 152Sm, 26.7%; 154Sm, 22.7% Selected Radioisotopes 145Sm, 153Sm Atomic Radius 238 pm Crystal Structure Trigonal Discovered by Lecoq de Boisbaudran, 1879

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