La
Lanthanum Symbol (La)
Lanthanum is element 57 of the periodic table. Copy its symbol La and see its atomic weight, electron configuration and physical properties.
What does La mean?
La is the chemical symbol for lanthanum, element number 57 in the periodic table. Lanthanum is a lanthanide in the f-block, period 6. It is a solid at room temperature and was discovered in 1839.
Codes and properties
| Chemical symbol | La |
|---|---|
| Atomic number (Z) | 57 |
| Atomic weight (PubChem) | 138.9055 |
| Group / period | f-block / 6 |
| Element category | lanthanide |
| Electron configuration | [Xe]6s² 5d¹ |
| State at 20 °C | Solid |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 1.1 |
| Melting point | 1191 K (917.85 °C) |
| Boiling point | 3737 K (3463.85 °C) |
| Density | 6.15 g/cm³ |
| Discovered | 1839 |
How to type La
- Plain text: type
La— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as H₂O — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{La}in math mode, or use the mhchem package:\ce{La}. - HTML:
La; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for lanthanum?
The chemical symbol for lanthanum is La.
What is the atomic number of lanthanum?
Lanthanum has atomic number 57, meaning each atom has 57 protons.
What is the electron configuration of lanthanum?
The ground-state electron configuration of lanthanum is [Xe]6s² 5d¹.
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Reference: Lanthanum on PubChem (NIH)