Number of Isotopes: 6
Electron Affinity (kJ/mol): 205.3
First Ionization Energy (kJ/mol): 870
Second Ionization Energy (kJ/mol): 1791
Third Ionization Energy (kJ/mol): Not applicable
Electronegativity: 2.28
Polarizability (Å3): 6.5
Atomic Volume (cm3/mol): 9.1
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 139
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 94
Ionic Radius3+ (pm): No data
Common Oxidation Numbers: +2, +4
Other Oxid. Numbers: +5, +6