Recognised as Chemical element
Samarium
- Sm
- Z = 62
- lanthanide
Samarium (Sm) is element 62, a lanthanide in period 6. Its standard atomic weight is 150.36 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolSm
Standard atomic weight150.36atomic mass units (Da)
Mass in kilograms2.4967865 × 10^-25
Categorylanthanide
GroupLanthanide/actinide series, with no group number
Period6
Blockf-block
Electrons in a neutral atom62
Neutrons in the most common isotope88≈
Electron configuration
Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f⁶ 5s² 5p⁶ 6s²ground state, subshells written in order of n
Noble gas shorthand[Xe] 4f⁶ 6s²
Electrons per shell2, 8, 18, 24, 8, 2K, L, M and outward
Electrons in the outer shell2
Unpaired electrons6Hund's rule; unpaired electrons make the free atom paramagnetic
Madelung ruleFollowedthe ground state is what the n + l filling order predicts
Quantities
Molar mass150.36 g/mol
Mass of one mole150.36 grams
Atoms in one gram4.0051482 × 10^21
Mass of one atom2.4967865 × 10^-22 g
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