| Property | Value |
|---|---|
| Atomic number | 57 |
| Atomic weight | 138.905477 amu |
| Element family | Transition metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 139La: 99.91% |
| Previous element | Barium |
| Next element | Cerium |
| Density | 6.145 g/cm3 (STP) |
| Melting | 920 °C |
| Boiling | 3454 °C |
| Covalent radius | 1.8 Å |
| Ionic radius | 1.061 Å |
| Metallic radius | 1.87 Å |
| First ionization potential | 5.577 eV |
| Electron affinity | 0.558 eV |
| Electronegativity | 1.1 |
| Discovery year | 1838 |
Lanthanum is an element number 57 from transition metals family. Its symbol is La. Lanthanum atomic weight is 138.905477 amu. La stable and long lived isotopes are 139La: 99.91%. Lanthanum electronic configuration is 1s22s22p63s23p63d104s24p64d105s25p66s25d1. Sample compounds that contain Lanthanum are LaF3, La2O3, LaCl3, La(NO3)3, LaNi5, La(NO3)3*6H2O.
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