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< Back Astatine  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 85 Atomic Symbol At Atomic Weight [210 amu] Group Halogen, 17 Form Solid Melting Point 302 °C (575.6 °F, 575.15 °K) Heat of Fusion 6 kJ/mol (approx.) Heat of Vaporization 40 kJ/mol (approx.) Electronegativity (on Pauling scale) 2.2 Ground State Electron Configuration 5d10 6s2 6p5 Oxidation States +1, +3, +5, +7, -1 Selected Radioisotopes 210At, 211At Atomic Radius 127 pm Discovered by Corson; MacKenzie; Segre, 1940

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