Symbol Ra Atomic radius: pm - Fusion: kJ/Mole 7.15
Name Radium Ionic radius: pm (+2)162 Boiling point: °C -
Atomic number 88 Electron affinity - Melting point: °C 700
Atomic weight 226.0 1st  ion potential 5.28 Specific Heat Cap: J/(g K) -
Classification Alk earth metal Natural form Solid Thermal Cond: W/(cm K) -
Configuration [Rn]7s2 Crystal structure BCC Electrical Cond -
Oxidation states 2 Density 5.0 Abundance: mg/kg-crust <0.001
Electronegativity 0.9 Vaporization: kJ/Mole 136.8    
Radium was discovered in 1898 by Pierre and Marie Curie and an assistant, G. Bémont. Uses -  neutron source, treating cancer, self-luminous paints