57
La
Lanthanum
Lanthanum
Lanthanum (La)
Lanthanides · Solid · Period 6 · Group 3
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Element Properties
- Atomic Number
- 57
- Symbol
- La
- Atomic Mass
- 138.9055
- Category
- Lanthanides
- Standard State
- Solid
- Period
- 6
- Group
- 3
- Electronegativity
- 1.1
- Atomic Radius
- 240
- Ionization Energy
- 5.58
- Electron Affinity
- 0.5
- Oxidation States
- +3
- Melting Point
- 1191 K (917.85 °C)
- Boiling Point
- 3737 K (3463.85 °C)
- Density
- 6.15
- Electron Configuration
- [Xe]6s2 5d1
- Year Discovered
- 1839
Frequently asked questions
What is the atomic number of Lanthanum?
The atomic number of Lanthanum is 57, which equals the number of protons in its nucleus.
What is the atomic mass of Lanthanum?
The atomic mass of Lanthanum is approximately 138.9055 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Lanthanum?
The electron configuration of Lanthanum is [Xe]6s2 5d1.
Where is Lanthanum in the periodic table?
Lanthanum is located in period 6, group 3.
When was Lanthanum discovered?
Lanthanum was discovered in 1839.
Related elements
Same group
21
Sc
Scandium
44.956
39
Y
Yttrium
88.906
58
Ce
Cerium
140.116
59
Pr
Praseodymium
140.908
60
Nd
Neodymium
144.24
61
Pm
Promethium
144.913