Samarium vs Europium

Side-by-side comparison of Samarium (Sm, element 62) and Europium (Eu, element 63) by atomic structure and physical properties.

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PropertySm Samarium Eu Europium
Atomic number6263
SymbolSmEu
NameSamariumEuropium
Categorylanthanidelanthanide
Standard Atomic Weight150.36 u151.964 u
Period66
GroupN/AN/A
Blockff
Phase at STPSolidSolid
Electron configuration[Xe]4f66s2[Xe]4f76s2
Oxidation states[0, 1, 2, 3][0, 2, 3]
Electronegativity (Pauling)1.17N/A
Electron affinity0.162 eV0.116 eV
Density7520 kg/m³5240 kg/m³
Melting point1073.85 °C821.85 °C
Boiling point1793.85 °C1528.85 °C
Discovery year18791896

Key Differences

PropertySm SamariumEu Europium
Standard Atomic Weight150.36 u ↓ lower151.964 u ↑ higher
Density7520 kg/m³ ↑ higher5240 kg/m³ ↓ lower
Melting point1073.85 °C ↑ higher821.85 °C ↓ lower
Boiling point1793.85 °C ↑ higher1528.85 °C ↓ lower
Electron affinity0.162 eV ↑ higher0.116 eV ↓ lower
Electron configuration[Xe]4f66s2 [Xe]4f76s2
Discovery year1879 1896