Niobium vs Dubnium

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PropertyNb NiobiumDb Dubnium
Atomic number41105
SymbolNbDb
NameNiobiumDubnium
Categorytransition-metaltransition-metal
Standard Atomic Weight92.90637 u268 u
Period57
Group55
Blockss
Phase at STPsolidN/A
Electron configuration[Kr]5s14d4[Rn]7s25f146d3
Oxidation states[-3, -1, 0, 1, 2, 3, 4, 5][3, 4, 5]
Electronegativity (Pauling)1.6N/A
Electron affinity0.893 eV0.56 eV
Density8570 kg/m³2.930000e+4 kg/m³
Melting point2476.85 °C-273.15 °C
Boiling point4743.85 °C-273.15 °C
Discovery year18011967