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< Back Thallium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 81 Atomic Symbol Tl Atomic Weight 204.3833 amu Group Other Metals, 13 Form Solid Density @ STP 11.8 g/cm3 Melting Point 304 °C (579.2 °F, 577.15 °K) Boiling Point 1473 °C (2683.4 °F, 1746.15 °K) Heat of Fusion 4.14 kJ/mol Heat of Vaporization 165 kJ/mol First Ionization Potential 6.10829 eV Electronegativity (on Pauling scale) 1.8 Specific Heat Capacity 0.129 J/g K Ground State Electron Configuration 5d10 6s2 6p1 Oxidation States +1, +3 Stable Isotopes and Natural Abundance on Earth 203Tl, 29.524%; 205Tl, 70.476% Selected Radioisotopes 201Tl Atomic Radius 156 pm Crystal Structure Hexagonal Discovered by Crookes, 1861

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