Ruthenium vs Tantalum

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PropertyRu RutheniumTa Tantalum
Atomic number4473
SymbolRuTa
NameRutheniumTantalum
Categorytransition-metaltransition-metal
Standard Atomic Weight101.07 u180.94788 u
Period56
Group85
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s14d7[Xe]6s24f145d3
Oxidation states[-4, -2, 1, 2, 3, 4, 5, 6, 7, 8][-3, -1, 0, 1, 2, 3, 4, 5]
Electronegativity (Pauling)2.21.5
Electron affinity1.05 eV0.322 eV
Density1.210000e+4 kg/m³1.640000e+4 kg/m³
Melting point2333.85 °C3016.85 °C
Boiling point4149.85 °C5457.85 °C
Discovery year18281802