Number of Isotopes: 4
Electron Affinity (kJ/mol): 64.3
First Ionization Energy (kJ/mol): 652.8
Second Ionization Energy (kJ/mol): 1592
Third Ionization Energy (kJ/mol): 2987.2
Electronegativity: 1.66
Polarizability (Å3): 11.6
Atomic Volume (cm3/mol): 7.3
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 128
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 90.5
Ionic Radius3+ (pm): 75.5
Common Oxidation Numbers: +3, +6
Other Oxid. Numbers: -2, -1, +1, +2, +4, +5