Chromium vs Ruthenium

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PropertyCr ChromiumRu Ruthenium
Atomic number2444
SymbolCrRu
NameChromiumRuthenium
Categorytransition-metaltransition-metal
Standard Atomic Weight51.9961 u101.07 u
Period45
Group68
Blockss
Phase at STPsolidsolid
Electron configuration[Ar]3d54s1[Kr]5s14d7
Oxidation states[-4, -2, -1, 0, 1, 2, 3, 4, 5, 6][-4, -2, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)1.662.2
Electron affinity0.675 eV1.05 eV
Density7150 kg/m³1.210000e+4 kg/m³
Melting point1906.85 °C2333.85 °C
Boiling point2670.85 °C4149.85 °C
Discovery year17971828