Arsenic vs Osmium

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PropertyAs ArsenicOs Osmium
Atomic number3376
SymbolAsOs
NameArsenicOsmium
Categorymetalloidtransition-metal
Standard Atomic Weight74.921595 u190.23 u
Period46
Group158
Blockps
Phase at STPsolidsolid
Electron configuration[Ar]4s23d104p3[Xe]6s24f145d6
Oxidation states[-3, -2, -1, 0, 1, 2, 3, 4, 5][-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)2.182.2
Electron affinity0.81 eV1.1 eV
Density5776 kg/m³2.258720e+4 kg/m³
Melting point816.85 °C3032.85 °C
Boiling point613.85 °C5011.85 °C
Discovery year12501803