Number of Isotopes: 6
Electron Affinity (kJ/mol): 53.7
First Ionization Energy (kJ/mol): 804.7
Second Ionization Energy (kJ/mol): 1894
Third Ionization Energy (kJ/mol): 3177.2
Electronegativity: 2.2
Polarizability (Å3): 4.8
Atomic Volume (cm3/mol): 8.9
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 137
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 100
Ionic Radius3+ (pm): 90
Common Oxidation Numbers: +2, +4
Other Oxid. Numbers: