Ruthenium vs Hafnium

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PropertyRu RutheniumHf Hafnium
Atomic number4472
SymbolRuHf
NameRutheniumHafnium
Categorytransition-metaltransition-metal
Standard Atomic Weight101.07 u178.49 u
Period56
Group84
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s14d7[Xe]6s24f145d2
Oxidation states[-4, -2, 1, 2, 3, 4, 5, 6, 7, 8][-2, 0, 1, 2, 3, 4]
Electronegativity (Pauling)2.21.3
Electron affinity1.05 eV0.178 eV
Density1.210000e+4 kg/m³1.330000e+4 kg/m³
Melting point2333.85 °C2232.85 °C
Boiling point4149.85 °C4602.85 °C
Discovery year18281911