57La
Lanthanum
Lanthanide
Properties of Lanthanum
- Atomic number (Z)
- 57
- Symbol
- La
- Name
- Lanthanum
- Atomic mass
- 138.905 u
- Period
- 6
- Group
- 3
- Family
- Lanthanides (f-block)
- Classification
- Lanthanide
- Electron configuration
- [Xe] 5d¹ 6s²
About Lanthanum
Lanthanum is a chemical element with symbol La and atomic number 57 (atomic mass of about 138.905 u). It is classified as a lanthanide on the periodic table.
On the periodic table, Lanthanum is located in period 6, in group 3, belonging to the lanthanides (f-block) family. An element's position reveals trends in its properties, such as atomic radius, electronegativity and metallic character.
The electron configuration of Lanthanum is [Xe] 5d¹ 6s², which determines how it forms chemical bonds and takes part in reactions.