Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Potassium | |
| Electron Configuration | 2,8,8,1 |
| Electron Configuration | [Ar] 4s1 |
| Electronegativity | 0.82 |
| Enthalpy of Fusion | 2.40 kJ mol-1 |
| Enthalpy of Vaporisation | 79.1 kJ mol-1 |
| Heat Capacity | 29.600 J mol-1 K-1 |
| Thermal Conductivity | 102.5 W m-1 K-1 |
| Thermal Expansion | 83.3 μm m-1 K-1 |
| Magnetic ordering | No data |
| Electrical resistivity | 72.0 Ω m |
| Speed of sound | 2000 m s-1 |
| Shear modulus | 2000 GPa |
| Bulk modulus | 3.1 GPa |
| Mohs hardness | 0.4 |
| Brinell hardness | 0.363 MPa |
| Atomic Radii |
|
| Atomic Radius
|
220 pm |
| Bohr Radius
|
243 pm |
| Covalent Radius
|
196 pm |
| Van der Waals
|
275 pm |
| Oxidation States |
|
| Main
|
K+1 |
| Other
|
K-1 (in liquid NH3) |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
418.8 |
| M+ - M2+ |
3051.4 |
| M2+ - M3+ |
4411 |
| M3+ - M4+ |
5877 |
| M4+ - M5+ |
7975 |
| M5+ - M6+ |
9649 |
| M6+ - M7+ |
11343 |
| M7+ - M8+ |
11942 |
| M8+ - M9+ |
16964 |
| M9+ - M10+ |
48575 |