Lanthanum
Lanthanide| Atomic number | 57 |
|---|---|
| Category | Lanthanide |
| Atomic mass | 138.91 |
| Electron configuration | [Xe]5d¹ 6s² |
| Oxidation states | +3 |
| Electronegativity | 1.1 |
| Melting point | 920 °C |
| Boiling point | 3,464 °C |
| Density | 6.16 g/cm³ |
| Crystal structure | Hexagonal |
| Period | 6 |
| Block | f |
| Discovered | 1,839 |
| Crustal abundance | 39 ppm |
