Lanthanum (La) — Lanthanide. Atomic number 57.
Silvery-white metal
- Atomic number: 57
- Symbol: La
- Atomic mass: 138.91 u
- Category: Lanthanide
- State: Solid
- Melting point: 919.85 °C / 1193 K
- Boiling point: 3463.85 °C / 3737 K
- Density: 6.15 g/cm³ (20°C)
- Electron configuration: [Xe] 5d1 6s2
- Oxidation states: +2, +3
- Electronegativity: 1.1
- Discovered by: Carl Gustav Mosander (1839)
Common uses: Camera lenses, Catalysts, Battery alloys
Biological role: No known biological role.
Frequently Asked Questions about Lanthanum
What is the atomic number of lanthanum?
Lanthanum has an atomic number of 57, meaning each atom contains 57 protons in its nucleus.
What is the atomic mass of lanthanum?
The standard atomic weight of lanthanum is 138.91 u (unified atomic mass units).
What category does lanthanum belong to?
Lanthanum is classified as a lanthanide.
What is the state of lanthanum at room temperature?
Lanthanum is a solid at 20 °C (68 °F).
What is the melting point of lanthanum?
The melting point of lanthanum is 919.85 °C / 1193 K.
What is the boiling point of lanthanum?
The boiling point of lanthanum is 3463.85 °C / 3737 K.
What is the density of lanthanum?
The density of lanthanum is 6.15 g/cm³ (20°C).
What is the electronegativity of lanthanum?
Lanthanum has a Pauling electronegativity of 1.1.
What is the electron configuration of lanthanum?
The electron configuration of lanthanum is [Xe] 5d1 6s2.
What are the common oxidation states of lanthanum?
Lanthanum commonly exhibits the following oxidation states: +2, +3.
When was lanthanum discovered?
Lanthanum was discovered in 1839 by Carl Gustav Mosander.
Is lanthanum radioactive?
Lanthanum is a stable element with no naturally occurring radioactive isotopes.
What is the biological role of lanthanum?
No known biological role.
What are the common uses of lanthanum?
Lanthanum is used for: Camera lenses; Catalysts; Battery alloys.
