Niobium vs Rhodium

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PropertyNb NiobiumRh Rhodium
Atomic number4145
SymbolNbRh
NameNiobiumRhodium
Categorytransition-metaltransition-metal
Standard Atomic Weight92.90637 u102.9055 u
Period55
Group59
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s14d4[Kr]5s14d8
Oxidation states[-3, -1, 0, 1, 2, 3, 4, 5][-3, -1, 1, 2, 3, 4, 5, 6, 7]
Electronegativity (Pauling)1.62.28
Electron affinity0.893 eV1.137 eV
Density8570 kg/m³1.240000e+4 kg/m³
Melting point2476.85 °C1963.85 °C
Boiling point4743.85 °C3694.85 °C
Discovery year18011803