Number of Isotopes: 4
Electron Affinity (kJ/mol):  
First Ionization Energy (kJ/mol): 509.4
Second Ionization Energy (kJ/mol): 979.1
Third Ionization Energy (kJ/mol): Not applicable
Electronegativity: 0.9
Polarizability (Å3): 38.3
Atomic Volume (cm3/mol): 41.1
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): No data
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 162
Ionic Radius3+ (pm): No data
Common Oxidation Numbers: +2
Other Oxid. Numbers: