Molybdenum vs Technetium

Side-by-side comparison of Molybdenum (Mo, element 42) and Technetium (Tc, element 43) by atomic structure and physical properties.

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PropertyMo Molybdenum Tc Technetium
Atomic number4243
SymbolMoTc
NameMolybdenumTechnetium
Categorytransition-metaltransition-metal
Standard Atomic Weight95.95 u98 u
Period55
Group67
Blockdd
Phase at STPSolidSolid
Electron configuration[Kr]4d55s1[Kr]4d55s2
Oxidation states[-4, -2, -1, 0, 1, 2, 3, 4, 5, 6][-3, -1, 1, 2, 3, 4, 5, 6, 7]
Electronegativity (Pauling)2.161.9
Electron affinity0.744 eV0.55 eV
Density1.02e+4 kg/m³1.1e+4 kg/m³
Melting point2622.85 °C2156.85 °C
Boiling point4638.85 °C4264.85 °C
Discovery year17781937

Key Differences

PropertyMo MolybdenumTc Technetium
Standard Atomic Weight95.95 u ↓ lower98 u ↑ higher
Density1.02e+4 kg/m³ ↓ lower1.1e+4 kg/m³ ↑ higher
Melting point2622.85 °C ↑ higher2156.85 °C ↓ lower
Boiling point4638.85 °C ↑ higher4264.85 °C ↓ lower
Electronegativity (Pauling)2.16 ↑ higher1.9 ↓ lower
Electron affinity0.744 eV ↑ higher0.55 eV ↓ lower
Group6 7
Electron configuration[Kr]4d55s1 [Kr]4d55s2
Discovery year1778 1937