Molybdenum vs Ruthenium

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PropertyMo MolybdenumRu Ruthenium
Atomic number4244
SymbolMoRu
NameMolybdenumRuthenium
Categorytransition-metaltransition-metal
Standard Atomic Weight95.95 u101.07 u
Period55
Group68
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s14d5[Kr]5s14d7
Oxidation states[-4, -2, -1, 0, 1, 2, 3, 4, 5, 6][-4, -2, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)2.162.2
Electron affinity0.744 eV1.05 eV
Density1.020000e+4 kg/m³1.210000e+4 kg/m³
Melting point2622.85 °C2333.85 °C
Boiling point4638.85 °C4149.85 °C
Discovery year17781828