Samarium vs Osmium

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PropertySm SamariumOs Osmium
Atomic number6276
SymbolSmOs
NameSamariumOsmium
Categorylanthanidetransition-metal
Standard Atomic Weight150.36 u190.23 u
Period66
GroupN/A8
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f6[Xe]6s24f145d6
Oxidation states[0, 1, 2, 3][-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)1.172.2
Electron affinity0.156 eV1.1 eV
Density7520 kg/m³2.258720e+4 kg/m³
Melting point1073.85 °C3032.85 °C
Boiling point1793.85 °C5011.85 °C
Discovery year18781803