Niobium vs Ruthenium

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PropertyNb NiobiumRu Ruthenium
Atomic number4144
SymbolNbRu
NameNiobiumRuthenium
Categorytransition-metaltransition-metal
Standard Atomic Weight92.90637 u101.07 u
Period55
Group58
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s14d4[Kr]5s14d7
Oxidation states[-3, -1, 0, 1, 2, 3, 4, 5][-4, -2, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)1.62.2
Electron affinity0.893 eV1.05 eV
Density8570 kg/m³1.210000e+4 kg/m³
Melting point2476.85 °C2333.85 °C
Boiling point4743.85 °C4149.85 °C
Discovery year18011828