Number of Isotopes: 7
Electron Affinity (kJ/mol): 101
First Ionization Energy (kJ/mol): 711.1
Second Ionization Energy (kJ/mol): 1617.1
Third Ionization Energy (kJ/mol): 2746.9
Electronegativity: 2.2
Polarizability (Å3): 9.6
Atomic Volume (cm3/mol): 8.1
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 134
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): No data
Ionic Radius3+ (pm): 82
Common Oxidation Numbers: +3, +4
Other Oxid. Numbers: -2, +1, +2, +5, +6, +7, +8