Number of Isotopes: 2
Electron Affinity (kJ/mol): 125.6
First Ionization Energy (kJ/mol): 731
Second Ionization Energy (kJ/mol): 2073.5
Third Ionization Energy (kJ/mol): 3360.6
Electronegativity: 1.93
Polarizability (Å3): 7.9
Atomic Volume (cm3/mol): 10.3
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 144
Ionic Radius1+ (pm): 129
Ionic Radius2+ (pm): 108
Ionic Radius3+ (pm): 89
Common Oxidation Numbers: +1
Other Oxid. Numbers: +2, +3