Symbol Fr Atomic radius: pm - Fusion: kJ/Mole -
Name Francium Ionic radius: pm - Boiling point: C -
Atomic number 87 Electron affinity 0.46 Melting point: C 27
Atomic weight 223.0 1st  ion potential - Specific Heat Cap: J/(g K) -
Classification Alkali metal Natural form Solid Thermal Cond: W/(cm K) -
Configuration [Rn]7s1 Crystal structure - Electrical Cond 0.03
Oxidation states 1 Density - Abundance: mg/kg-crust <0.001
Electronegativity 0.7 Vaporization: kJ/Mole -    
Francium was discovered by Marguerite Perey in 1939. Uses -  no uses known