Number of Isotopes: 4
Electron Affinity (kJ/mol): 15.7
First Ionization Energy (kJ/mol): 759.3
Second Ionization Energy (kJ/mol): 1561.1
Third Ionization Energy (kJ/mol): 2957.3
Electronegativity: 1.9
Polarizability (Å3): 8.4
Atomic Volume (cm3/mol): 7.1
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 126
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 83.5
Ionic Radius3+ (pm): 73.8
Common Oxidation Numbers: +2, +3
Other Oxid. Numbers: -2, -1, +1, +4, +5, +6