Number of Isotopes: 4
Electron Affinity (kJ/mol):  
First Ionization Energy (kJ/mol): 549.5
Second Ionization Energy (kJ/mol): 1064.2
Third Ionization Energy (kJ/mol): 4206.7
Electronegativity: 0.95
Polarizability (Å3): 27.6
Atomic Volume (cm3/mol): 33.3
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 215
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 132
Ionic Radius3+ (pm): No data
Common Oxidation Numbers: +2
Other Oxid. Numbers: