57La138.91
Lanthanum
Lanthanide · element 57 · f-block (shown below the main table)
Quick facts
| Symbol | La |
|---|---|
| Atomic number | 57 |
| Relative atomic mass | 138.91 |
| Category | Lanthanide |
| Position | f-block (shown below the main table) |
| State at 20 °C | Solid |
| Melting point | 920 °C |
| Boiling point | 3,464 °C |
| Density | 6.162 g/cm³ |
| Electronegativity | 1.1 |
| Electron configuration | [Xe] 5d1 6s2 |
About Lanthanum
Lanthanum has the symbol La and atomic number 57, which means every lanthanum atom has 57 protons in its nucleus and, in a neutral atom, 57 electrons. At room temperature it is a solid.
Lanthanides are the first row of the f-block. Many are used in strong magnets, screens and lasers.
It melts at 920 °C and boils at 3,464 °C.
Explore it
See where lanthanum sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.