Niobium vs Lead

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PropertyNb NiobiumPb Lead
Atomic number4182
SymbolNbPb
NameNiobiumLead
Categorytransition-metalpost-transition-metal
Standard Atomic Weight92.90637 u207.2 u
Period56
Group514
Blocksp
Phase at STPsolidsolid
Electron configuration[Kr]5s14d4[Xe]6s24f145d106p2
Oxidation states[-3, -1, 0, 1, 2, 3, 4, 5][-4, -2, -1, 0, 1, 2, 3, 4]
Electronegativity (Pauling)1.62.33
Electron affinity0.893 eV0.364 eV
Density8570 kg/m³1.134200e+4 kg/m³
Melting point2476.85 °C327.46 °C
Boiling point4743.85 °C1748.85 °C
Discovery year18012021