Promethium vs Bismuth

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PropertyPm PromethiumBi Bismuth
Atomic number6183
SymbolPmBi
NamePromethiumBismuth
Categorylanthanidepost-transition-metal
Standard Atomic Weight145 u208.9804 u
Period66
GroupN/A15
Blocksp
Phase at STPsolidsolid
Electron configuration[Xe]6s24f5[Xe]6s24f145d106p3
Oxidation states[2, 3][-3, -2, -1, 0, 1, 2, 3, 4, 5]
Electronegativity (Pauling)N/A2.02
Electron affinity0.129 eV0.942 eV
Density7260 kg/m³9807 kg/m³
Melting point1041.85 °C271.4 °C
Boiling point2999.85 °C1563.85 °C
Discovery year19021753