Technetium vs Ruthenium

Side-by-side comparison of Technetium (Tc, element 43) and Ruthenium (Ru, element 44) by atomic structure and physical properties.

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PropertyTc Technetium Ru Ruthenium
Atomic number4344
SymbolTcRu
NameTechnetiumRuthenium
Categorytransition-metaltransition-metal
Standard Atomic Weight98 u101.07 u
Period55
Group78
Blockdd
Phase at STPSolidSolid
Electron configuration[Kr]4d55s2[Kr]4d75s1
Oxidation states[-3, -1, 1, 2, 3, 4, 5, 6, 7][-4, -2, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)1.92.2
Electron affinity0.55 eV1.05 eV
Density1.1e+4 kg/m³1.21e+4 kg/m³
Melting point2156.85 °C2333.85 °C
Boiling point4264.85 °C4149.85 °C
Discovery year19371827

Key Differences

PropertyTc TechnetiumRu Ruthenium
Standard Atomic Weight98 u ↓ lower101.07 u ↑ higher
Density1.1e+4 kg/m³ ↓ lower1.21e+4 kg/m³ ↑ higher
Melting point2156.85 °C ↓ lower2333.85 °C ↑ higher
Boiling point4264.85 °C ↑ higher4149.85 °C ↓ lower
Electronegativity (Pauling)1.9 ↓ lower2.2 ↑ higher
Electron affinity0.55 eV ↓ lower1.05 eV ↑ higher
Group7 8
Electron configuration[Kr]4d55s2 [Kr]4d75s1
Discovery year1937 1827