Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Lanthanum | |
| Electron Configuration | 2,8,18,18,9,2 |
| Electron Configuration | [Xe]] 5d1 6s2 |
| Electronegativity | 1.1 |
| Enthalpy of Fusion | 10.04 kJ mol-1 |
| Enthalpy of Vaporisation | 402.1 kJ mol-1 |
| Heat Capacity | 27.11 J mol-1 K-1 |
| Thermal Conductivity | 13.4 W m-1 K-1 |
| Thermal Expansion | 12.1 μm m-1 K-1 |
| Magnetic ordering | No data |
| Electrical resistivity | 615 Ω m |
| Speed of sound | 2475 m s-1 |
| Young's modulus | 36.6 GPa |
| Shear modulus | 2475 GPa |
| Bulk modulus | 27.9 GPa |
| Poisson ratio | 0.280 |
| Mohs hardness | 2.5 |
| Vickers hardness | 491 MPa |
| Brinell hardness | 363 MPa |
| Atomic Radii |
|
| Atomic Radius
|
195 pm |
| Bohr Radius
|
0 pm |
| Covalent Radius
|
169 pm |
| Van der Waals
|
0 pm |
| Oxidation States |
|
| Main
|
La+3 |
| Other
|
|
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
538.1 |
| M+ - M2+ |
1067 |
| M2+ - M3+ |
1850 |
| M3+ - M4+ |
4819 |
| M4+ - M5+ |
6400 |
| M5+ - M6+ |
7600 |
| M6+ - M7+ |
9600 |
| M7+ - M8+ |
11000 |
| M8+ - M9+ |
12400 |
| M9+ - M10+ |
15900 |