Praseodymium vs Tantalum

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PropertyPr PraseodymiumTa Tantalum
Atomic number5973
SymbolPrTa
NamePraseodymiumTantalum
Categorylanthanidetransition-metal
Standard Atomic Weight140.90766 u180.94788 u
Period66
GroupN/A5
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f3[Xe]6s24f145d3
Oxidation states[0, 1, 2, 3, 4, 5][-3, -1, 0, 1, 2, 3, 4, 5]
Electronegativity (Pauling)1.131.5
Electron affinity0.962 eV0.322 eV
Density6770 kg/m³1.640000e+4 kg/m³
Melting point930.85 °C3016.85 °C
Boiling point3519.85 °C5457.85 °C
Discovery year18851802