Niobium vs Molybdenum

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PropertyNb NiobiumMo Molybdenum
Atomic number4142
SymbolNbMo
NameNiobiumMolybdenum
Categorytransition-metaltransition-metal
Standard Atomic Weight92.90637 u95.95 u
Period55
Group56
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s14d4[Kr]5s14d5
Oxidation states[-3, -1, 0, 1, 2, 3, 4, 5][-4, -2, -1, 0, 1, 2, 3, 4, 5, 6]
Electronegativity (Pauling)1.62.16
Electron affinity0.893 eV0.744 eV
Density8570 kg/m³1.020000e+4 kg/m³
Melting point2476.85 °C2622.85 °C
Boiling point4743.85 °C4638.85 °C
Discovery year18011778