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< Back Radium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 88 Atomic Symbol Ra Atomic Weight [226 amu] Group Alkaline Earth, 2 Form Solid Density @ STP 5 g/cm3 Melting Point 700 °C (1292 °F, 973.15 °K) Boiling Point 1736.85 °C (3158.33 °F, 2010 °K) Heat of Fusion 8 kJ/mol (approx.) Heat of Vaporization 125 kJ/mol (approx.) First Ionization Potential 5.27892 eV Electronegativity (on Pauling scale) 0.9 Ground State Electron Configuration 5d10 6s2 6p6 6f2 Oxidation States +2 Selected Radioisotopes 223Ra, 224Ra, 226Ra, 228Ra Crystal Structure Cubic Discovered by Pierre and Marie Curie, 1898

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