La
Lanthanum
Element 57 · Lanthanide · Period 6, Group 3
Solid · Discovered 1839
Atomic Properties
| Atomic Number | 57 |
| Atomic Mass | 138.9055u |
| Electron Configuration | [Xe]6s2 5d1 |
| Electronegativity | 1.1Pauling |
| Atomic Radius | 240pm |
| Ionization Energy | 5.577eV |
| Electron Affinity | 0.5eV |
| Oxidation States | +3 |
Physical Properties
| Standard State | Solid |
| Melting Point | 1191K |
| Boiling Point | 3737K |
| Density | 6.15g/cm³ |
| Group Block | Lanthanide |
| Year Discovered | 1839 |