Number of Isotopes: 3
Electron Affinity (kJ/mol):  
First Ionization Energy (kJ/mol): 587
Second Ionization Energy (kJ/mol): 1110
Third Ionization Energy (kJ/mol): 1930
Electronegativity: 1.3
Polarizability (Å3): 32.1
Atomic Volume (cm3/mol): 19.7
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 179
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): No data
Ionic Radius3+ (pm): No data
Common Oxidation Numbers: +4
Other Oxid. Numbers: +2, +3