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Lanthanum (La)
Atomic number 57 · Lanthanide
| Atomic number | 57 |
|---|---|
| Atomic mass | 138.90547 u |
| Molar mass | 138.90547 g/mol |
| Category | Lanthanide |
| Group / period / block | 3 / 6 / d |
| Electron configuration | [Xe] 5d 6s2 |
| Electrons per shell | 2, 8, 18, 18, 9, 2 |
| Electronegativity (Pauling) | 1.1 |
| Atomic radius | 195.0 pm |
| Density | 6.15 g/cm³ |
| First ionisation energy | 5.5769 eV |
| Melting point | 1193.15 K (920.00 °C) |
| Boiling point | 3737.15 K (3464.00 °C) |
| Common oxidation states | +3 |
| Abundance in Earth's crust | 39 ppm |
Uses
Camera lenses, hybrid-car batteries
Discovery
1839, Carl Mosander