Number of Isotopes: 4
Electron Affinity (kJ/mol): 35.1
First Ionization Energy (kJ/mol): 715.6
Second Ionization Energy (kJ/mol): 1450
Third Ionization Energy (kJ/mol): 3082
Electronegativity: 2.1
Polarizability (å3): 6.8
Atomic Volume (cm3/mol): 18.3
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 146
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 133
Ionic Radius3+ (pm): No data
Common Oxidation Numbers: +2, +4
Other Oxid. Numbers: -4