Cobalt vs Rhodium

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PropertyCo CobaltRh Rhodium
Atomic number2745
SymbolCoRh
NameCobaltRhodium
Categorytransition-metaltransition-metal
Standard Atomic Weight58.933194 u102.9055 u
Period45
Group99
Blockss
Phase at STPsolidsolid
Electron configuration[Ar]4s23d7[Kr]5s14d8
Oxidation states[-3, -1, 0, 1, 2, 3, 4, 5][-3, -1, 1, 2, 3, 4, 5, 6, 7]
Electronegativity (Pauling)1.882.28
Electron affinity0.661 eV1.137 eV
Density8860 kg/m³1.240000e+4 kg/m³
Melting point1494.85 °C1963.85 °C
Boiling point2926.85 °C3694.85 °C
Discovery year17351803