Periodic Table
62
Sm
150.36
Samarium
LanthanoidSmCo magnets; +2 state notable.
Electronic Configuration
[Xe] 4f⁶ 6s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f⁶ 6s²
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
24e⁻n=4
8e⁻n=5
2e⁻n=6
Properties
Atomic number
62
Atomic mass
150.36 u
Category
Lanthanoid
Block / Group / Period
f · — · 6
Valence electrons
2
Oxidation states
+2, +3
Electronegativity
1.17
Atomic radius
238 pm
Ionization energy
545 kJ/mol
Electron affinity
50 kJ/mol
Melting point
1345 K / 1072 °C
Boiling point
2067 K / 1794 °C
Density
7.52 g/cm³
State at 25 °C
solid
Personal Notes
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