Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Cobalt | |
| Electron Configuration | 2,8,15,2 |
| Electron Configuration | [Ar] 3d7 4s2 |
| Electronegativity | 1.88 |
| Enthalpy of Fusion | 15.2 kJ mol-1 |
| Enthalpy of Vaporisation | 382.4 kJ mol-1 |
| Heat Capacity | 24.81 J mol-1 K-1 |
| Thermal Conductivity | 100 W m-1 K-1 |
| Thermal Expansion | 13 μm m-1 K-1 |
| Magnetic ordering | Ferromagnetic |
| Electrical resistivity | 62.4 Ω m |
| Speed of sound | 4720 m s-1 |
| Young's modulus | 209 GPa |
| Shear modulus | 4720 GPa |
| Bulk modulus | 180 GPa |
| Poisson ratio | 0.31 |
| Mohs hardness | 5.0 |
| Vickers hardness | 1043 MPa |
| Brinell hardness | 700 MPa |
| Atomic Radii |
|
| Atomic Radius
|
135 pm |
| Bohr Radius
|
152 pm |
| Covalent Radius
|
126 pm |
| Van der Waals
|
0 pm |
| Oxidation States |
|
| Main
|
Co+2 |
| Other
|
Co-1, Co0, Co+1, Co+3, Co+4, Co+5 |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
760 |
| M+ - M2+ |
1646 |
| M2+ - M3+ |
3232 |
| M3+ - M4+ |
4950 |
| M4+ - M5+ |
7670 |
| M5+ - M6+ |
9840 |
| M6+ - M7+ |
12400 |
| M7+ - M8+ |
15100 |
| M8+ - M9+ |
17900 |
| M9+ - M10+ |
26600 |