Strontium vs Osmium

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PropertySr StrontiumOs Osmium
Atomic number3876
SymbolSrOs
NameStrontiumOsmium
Categoryalkaline-earth-metaltransition-metal
Standard Atomic Weight87.62 u190.23 u
Period56
Group28
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s2[Xe]6s24f145d6
Oxidation states[1, 2][-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)0.952.2
Electron affinity0.052 eV1.1 eV
Density2640 kg/m³2.258720e+4 kg/m³
Melting point776.85 °C3032.85 °C
Boiling point1381.85 °C5011.85 °C
Discovery year17921803