Praseodymium vs Rutherfordium

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PropertyPr PraseodymiumRf Rutherfordium
Atomic number59104
SymbolPrRf
NamePraseodymiumRutherfordium
Categorylanthanidetransition-metal
Standard Atomic Weight140.90766 u263 u
Period67
GroupN/A4
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f3[Rn]7s25f146d2
Oxidation states[0, 1, 2, 3, 4, 5][3, 4]
Electronegativity (Pauling)1.13N/A
Electron affinity0.962 eV0.65 eV
Density6770 kg/m³2.330000e+4 kg/m³
Melting point930.85 °C2126.85 °C
Boiling point3519.85 °C5526.85 °C
Discovery year18851964