Sm
Samarium
Z 62 150.36 g/molLanthanide
Nucleus
62 Protons
88 Neutrons
62 Electrons (2 Valence)
Shell distribution: K2 • L8 • M18 • N24 • O8 • 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]4f66s2
Oxidation States
CommonRare
0
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Radii
Empirical
185 pm1.85 Å
Calculated
238 pm2.38 Å
Covalent
198±8 pm1.98±0.08 Å
Van der Waals
229 pm2.29 Å
IonicSm3+
95.8 pm0.958 Å
Crystal Structure
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RhombohedralStandard state
Pearson symbol
hR3
Space group
R3m No. 166
Density
7.52 g/cm³