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< Back Thulium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 69 Atomic Symbol Tm Atomic Weight 168.93421 amu Group Rare Earth (Lanthanide Series) Form Solid Density @ STP 9.32 g/cm3 Melting Point 1545 °C (2843 °F, 1818.15 °K) Boiling Point 1950 °C (3542 °F, 2223.15 °K) Heat of Fusion 16.84 kJ/mol Heat of Vaporization 250 kJ/mol First Ionization Potential 6.18431 eV Electronegativity (on Pauling scale) 1.25 Specific Heat Capacity 0.129 J/g K Ground State Electron Configuration 4f13 5s2 5p6 6s2 Oxidation States +3 Stable Isotopes and Natural Abundance on Earth 169Tm, 100% Selected Radioisotopes 170Tm, 171Tm Atomic Radius 222 pm Crystal Structure Hexagonal Discovered by Cleve, 1879

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