Terbium vs Osmium

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PropertyTb TerbiumOs Osmium
Atomic number6576
SymbolTbOs
NameTerbiumOsmium
Categorylanthanidetransition-metal
Standard Atomic Weight158.92535 u190.23 u
Period66
GroupN/A8
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f9[Xe]6s24f145d6
Oxidation states[0, 1, 2, 3, 4][-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)N/A2.2
Electron affinity1.124 eV1.1 eV
Density8230 kg/m³2.258720e+4 kg/m³
Melting point1355.85 °C3032.85 °C
Boiling point3229.85 °C5011.85 °C
Discovery year18431803