Praseodymium vs Osmium

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PropertyPr PraseodymiumOs Osmium
Atomic number5976
SymbolPrOs
NamePraseodymiumOsmium
Categorylanthanidetransition-metal
Standard Atomic Weight140.90766 u190.23 u
Period66
GroupN/A8
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f3[Xe]6s24f145d6
Oxidation states[0, 1, 2, 3, 4, 5][-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)1.132.2
Electron affinity0.962 eV1.1 eV
Density6770 kg/m³2.258720e+4 kg/m³
Melting point930.85 °C3032.85 °C
Boiling point3519.85 °C5011.85 °C
Discovery year18851803