Praseodymium vs Rhenium

← Back to Periodic Table
PropertyPr PraseodymiumRe Rhenium
Atomic number5975
SymbolPrRe
NamePraseodymiumRhenium
Categorylanthanidetransition-metal
Standard Atomic Weight140.90766 u186.207 u
Period66
GroupN/A7
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f3[Xe]6s24f145d5
Oxidation states[0, 1, 2, 3, 4, 5][-3, -1, 0, 1, 2, 3, 4, 5, 6, 7]
Electronegativity (Pauling)1.131.9
Electron affinity0.962 eV0.15 eV
Density6770 kg/m³2.080000e+4 kg/m³
Melting point930.85 °C3185.85 °C
Boiling point3519.85 °C5595.85 °C
Discovery year18851925