Holmium vs Osmium

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PropertyHo HolmiumOs Osmium
Atomic number6776
SymbolHoOs
NameHolmiumOsmium
Categorylanthanidetransition-metal
Standard Atomic Weight164.93033 u190.23 u
Period66
GroupN/A8
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f11[Xe]6s24f145d6
Oxidation states[0, 1, 2, 3][-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)1.232.2
Electron affinity0.338 eV1.1 eV
Density8800 kg/m³2.258720e+4 kg/m³
Melting point1473.85 °C3032.85 °C
Boiling point2699.85 °C5011.85 °C
Discovery year18781803