Cobalt vs Ruthenium

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PropertyCo CobaltRu Ruthenium
Atomic number2744
SymbolCoRu
NameCobaltRuthenium
Categorytransition-metaltransition-metal
Standard Atomic Weight58.933194 u101.07 u
Period45
Group98
Blockss
Phase at STPsolidsolid
Electron configuration[Ar]4s23d7[Kr]5s14d7
Oxidation states[-3, -1, 0, 1, 2, 3, 4, 5][-4, -2, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)1.882.2
Electron affinity0.661 eV1.05 eV
Density8860 kg/m³1.210000e+4 kg/m³
Melting point1494.85 °C2333.85 °C
Boiling point2926.85 °C4149.85 °C
Discovery year17351828