Number of Isotopes: 5
Electron Affinity (kJ/mol): 7.6
First Ionization Energy (kJ/mol): 658
Second Ionization Energy (kJ/mol): 1310.3
Third Ionization Energy (kJ/mol): 2652.5
Electronegativity: 1.54
Polarizability (Å3): 14.6
Atomic Volume (cm3/mol): 10.6
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 147
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 100
Ionic Radius3+ (pm): 81
Common Oxidation Numbers: +4
Other Oxid. Numbers: -1, +2, +3