Zirconium vs Ruthenium

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PropertyZr ZirconiumRu Ruthenium
Atomic number4044
SymbolZrRu
NameZirconiumRuthenium
Categorytransition-metaltransition-metal
Standard Atomic Weight91.224 u101.07 u
Period55
Group48
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s24d2[Kr]5s14d7
Oxidation states[1, 2, 3, 4][-4, -2, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)1.332.2
Electron affinity0.426 eV1.05 eV
Density6520 kg/m³1.210000e+4 kg/m³
Melting point1854.85 °C2333.85 °C
Boiling point4408.85 °C4149.85 °C
Discovery year17891828