Number of Isotopes: 5
Electron Affinity (kJ/mol): 111.5
First Ionization Energy (kJ/mol): 736.7
Second Ionization Energy (kJ/mol): 1752.9
Third Ionization Energy (kJ/mol): 3393.4
Electronegativity: 1.91
Polarizability (Å3): 6.8
Atomic Volume (cm3/mol): 6.6
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 124
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 83
Ionic Radius3+ (pm): 72
Common Oxidation Numbers: +2
Other Oxid. Numbers: -1, +1, +3, +4