Number of Isotopes: 7
Electron Affinity (kJ/mol):  
First Ionization Energy (kJ/mol): 502.9
Second Ionization Energy (kJ/mol): 965.2
Third Ionization Energy (kJ/mol): Not applicable
Electronegativity: 0.89
Polarizability (Å3): 39.7
Atomic Volume (cm3/mol): 37.9
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 222
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 149
Ionic Radius3+ (pm): No data
Common Oxidation Numbers: +2
Other Oxid. Numbers: