Zirconium vs Osmium

← Back to Periodic Table
PropertyZr ZirconiumOs Osmium
Atomic number4076
SymbolZrOs
NameZirconiumOsmium
Categorytransition-metaltransition-metal
Standard Atomic Weight91.224 u190.23 u
Period56
Group48
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s24d2[Xe]6s24f145d6
Oxidation states[1, 2, 3, 4][-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)1.332.2
Electron affinity0.426 eV1.1 eV
Density6520 kg/m³2.258720e+4 kg/m³
Melting point1854.85 °C3032.85 °C
Boiling point4408.85 °C5011.85 °C
Discovery year17891803