Atomic Properties
- Atomic Number
- 57
- Atomic Mass
- 138.9100 u
- Electron Configuration
- [Xe] 5d1 6s2
- Electronegativity
- 1.10
- Block
- f-block
- Group
- —
- Period
- 6
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 1193.00 K
- Boiling Point
- 3737.00 K
- Density
- 6.1620 g/cm³
About Lanthanum
First lanthanide; used in camera lenses and hybrid car batteries.
Isotopes of Lanthanum
Lanthanum has 2 naturally occurring isotopes.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 138La | 138 | 137.9071149 | 0.0888% | Stable |
| 139La | 139 | 138.9063563 | 99.91% | Stable |
Data source: NIH PubChem (aggregated from IUPAC, NIST)