Praseodymium vs Hafnium

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PropertyPr PraseodymiumHf Hafnium
Atomic number5972
SymbolPrHf
NamePraseodymiumHafnium
Categorylanthanidetransition-metal
Standard Atomic Weight140.90766 u178.49 u
Period66
GroupN/A4
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f3[Xe]6s24f145d2
Oxidation states[0, 1, 2, 3, 4, 5][-2, 0, 1, 2, 3, 4]
Electronegativity (Pauling)1.131.3
Electron affinity0.962 eV0.178 eV
Density6770 kg/m³1.330000e+4 kg/m³
Melting point930.85 °C2232.85 °C
Boiling point3519.85 °C4602.85 °C
Discovery year18851911