57La
Element 57
Lanthanum
Lanthanides
Lanthanum is a soft, ductile, silvery-white metallic chemical element with symbol La and atomic number 57.
Key data
- Atomic number
- 57
- Atomic mass
- 138.905 u
- Group / Period
- 3 / 6
- Block
- f-block
- Phase at STP
- Solid
- Density
- 6.162 g/cm³
- Melting point
- 919.9 °C
- Boiling point
- 3463.8 °C
- Electron configuration
- [Xe] 5d16s2
Common uses
- •Camera lenses
- •Hybrid car batteries
- •Lighter flints
Discovery
Year: 1839
Discovered by: Carl Gustaf Mosander
Frequently asked questions
What is the atomic number of Lanthanum?
Lanthanum has atomic number 57. Its symbol is La and its atomic mass is 138.905 u.
What category of element is Lanthanum?
Lanthanum is classified as lanthanides. It sits in group 3, period 6 of the periodic table.
What is Lanthanum used for?
Common uses of Lanthanum include: Camera lenses, Hybrid car batteries, Lighter flints.
When was Lanthanum discovered?
Lanthanum was discovered in 1839 by Carl Gustaf Mosander.
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