Molybdenum vs Hafnium

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PropertyMo MolybdenumHf Hafnium
Atomic number4272
SymbolMoHf
NameMolybdenumHafnium
Categorytransition-metaltransition-metal
Standard Atomic Weight95.95 u178.49 u
Period56
Group64
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s14d5[Xe]6s24f145d2
Oxidation states[-4, -2, -1, 0, 1, 2, 3, 4, 5, 6][-2, 0, 1, 2, 3, 4]
Electronegativity (Pauling)2.161.3
Electron affinity0.744 eV0.178 eV
Density1.020000e+4 kg/m³1.330000e+4 kg/m³
Melting point2622.85 °C2232.85 °C
Boiling point4638.85 °C4602.85 °C
Discovery year17781911