| Element | Lanthanum | Symbol | La |
| Atomic Number | 57 | Molar Mass | 138.91 gmol-1 |
| Electron Configuration | [Xe]5d16s2 | Normal State | solid metal |
| Density @STP | 6.17 g cm-3 | Melting Point | 918oC |
| Boiling Point | 3464oC | Stable Isotopes | 138La, 139La |
| Atomic Radius | 188 pm | Ionic Radius | 122 (3+) pm |
| Electronegativity (Pauling) | 1.1 | Ionization Energy (1st) | 538 kJ mol-1 |
| Ionization Energy (2nd) | 1067 kJ mol-1 | Ionization Energy (3rd) | 1850 kJ mol-1 |
| Molar Heat Capacity | 27.1 J K-1mol-1 | Standard Molar Entropy | 56.9 J K-1mol-1 |
| Enthalpy of Fusion | 10.04 kJ mol-1 | Enthalpy of Vapourization | 399.6 kJ mol-1 |