Molybdenum vs Tantalum

← Back to Periodic Table
PropertyMo MolybdenumTa Tantalum
Atomic number4273
SymbolMoTa
NameMolybdenumTantalum
Categorytransition-metaltransition-metal
Standard Atomic Weight95.95 u180.94788 u
Period56
Group65
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s14d5[Xe]6s24f145d3
Oxidation states[-4, -2, -1, 0, 1, 2, 3, 4, 5, 6][-3, -1, 0, 1, 2, 3, 4, 5]
Electronegativity (Pauling)2.161.5
Electron affinity0.744 eV0.322 eV
Density1.020000e+4 kg/m³1.640000e+4 kg/m³
Melting point2622.85 °C3016.85 °C
Boiling point4638.85 °C5457.85 °C
Discovery year17781802