Carbon vs Osmium

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PropertyC CarbonOs Osmium
Atomic number676
SymbolCOs
NameCarbonOsmium
Categorynonmetaltransition-metal
Standard Atomic Weight12.0106 u190.23 u
Period26
Group148
Blockps
Phase at STPsolidsolid
Electron configuration[He]2s22p2[Xe]6s24f145d6
Oxidation states[-4, -3, -2, -1, 0, 1, 2, 3, 4][-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)2.552.2
Electron affinity1.2621 eV1.1 eV
Density2267 kg/m³2.258720e+4 kg/m³
Melting point3549.85 °C3032.85 °C
Boiling point3824.85 °C5011.85 °C
Discovery year17971803