Number of Isotopes: 7
Electron Affinity (kJ/mol): 72
First Ionization Energy (kJ/mol): 684.9
Second Ionization Energy (kJ/mol): 1588.2
Third Ionization Energy (kJ/mol): 2620.5
Electronegativity: 2.24
Polarizability (Å3): 12.8
Atomic Volume (cm3/mol): 9.3
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 139
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): No data
Ionic Radius3+ (pm): 83
Common Oxidation Numbers: +4, +6
Other Oxid. Numbers: -2, -1, +1, +2, +3, +5