La
Lanthanum
Z 57 138.905 g/molLanthanide
Nucleus
57 Protons
82 Neutrons
57 Electrons (3 Valence)
Shell distribution: K2 • L8 • M18 • N18 • O9 • P2 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Xe]5d16s2
Oxidation States
CommonRare
0
Pick a state to see its ions
Radii
Empirical
195 pm1.95 Å
Calculated
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Covalent
207±8 pm2.07±0.08 Å
Van der Waals
240 pm2.4 Å
IonicLa3+
103.2 pm1.032 Å
Crystal Structure
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Double hexagonal close-packedStandard state
Pearson symbol
hP4
Space group
P63/mmc No. 194
Density
6.162 g/cm³