Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Rubidium | |
| Electron Configuration | 2,8,18,8,1 |
| Electron Configuration | [Kr] 5s1 |
| Electronegativity | 0.82 |
| Enthalpy of Fusion | 2.2 kJ mol-1 |
| Enthalpy of Vaporisation | 75.7 kJ mol-1 |
| Heat Capacity | 31.060 J mol-1 K-1 |
| Thermal Conductivity | 58.2 W m-1 K-1 |
| Thermal Expansion | ? μm m-1 K-1 |
| Magnetic ordering | No data |
| Electrical resistivity | 128 Ω m |
| Speed of sound | 1300 m s-1 |
| Young's modulus | 2.4 GPa |
| Bulk modulus | 2.5 GPa |
| Mohs hardness | 0.3 |
| Brinell hardness | 0.216 MPa |
| Atomic Radii |
|
| Atomic Radius
|
235 pm |
| Bohr Radius
|
265 pm |
| Covalent Radius
|
211 pm |
| Van der Waals
|
244 pm |
| Oxidation States |
|
| Main
|
Rb-1 (in liquid NH3), Rb+1 |
| Other
|
|
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
403 |
| M+ - M2+ |
2632 |
| M2+ - M3+ |
3900 |
| M3+ - M4+ |
5080 |
| M4+ - M5+ |
6850 |
| M5+ - M6+ |
8140 |
| M6+ - M7+ |
9570 |
| M7+ - M8+ |
13100 |
| M8+ - M9+ |
14800 |
| M9+ - M10+ |
26740 |