| Number of Isotopes: | 2 |
| Electron Affinity (kJ/mol): | 58.3919 |
| First Ionization Energy (kJ/mol): | 520.2217 |
| Second Ionization Energy (kJ/mol): | 7298.1655 |
| Third Ionization Energy (kJ/mol): | 11815.0389 |
| Electronegativity: | 0.98 |
| Polarizability (Å3): | 24.3 |
| Atomic Volume (cm3/mol): | 12.998 |
| Ionic Radius2- (pm): | no data |
| Ionic Radius1- (pm): | no data |
| Atomic Radius (pm): | 152 |
| Ionic Radius1+ (pm): | 76 |
| Ionic Radius2+ (pm): | no data |
| Ionic Radius3+ (pm): | no data |
| Common Oxidation Numbers: | +1 |
| Other Oxid. Numbers: | -1 |