Oxygen vs Samarium

PropertyO OxygenSm Samarium
Atomic number862
SymbolOSm
NameOxygenSamarium
Categorynonmetallanthanide
Standard Atomic Weight15.9994 u150.36 u
Period26
Group16N/A
Blockps
Phase at STPgassolid
Electron configuration[He]2s22p4[Xe]6s24f6
Oxidation states[-2, -1, 0, 1, 2][0, 1, 2, 3]
Electronegativity (Pauling)3.441.17
Electron affinity1.4611 eV0.156 eV
Density1.429 kg/m³7520 kg/m³
Melting point-218.79 °C1073.85 °C
Boiling point-182.95 °C1793.85 °C
Discovery year17711878