Technetium

The following table lists the ionization energies IE (ionization potentials); the IE is the energy required in electron volt (eV) per atom to separate a given electron from an Technetium atom.

IE1	IE2	IE3
7.28	15.26	29.54

Isotopic Data of Technetium

An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Technetium isotopes.

Chemistry of Technetium

Oxidation states+4. +7Electronegativity1.9 (Pauling original)
1.90 (Pauling)
1.51 (Allen)
3.2244 eV (Gosh Gupta)Electron affinity0.55(20) eV
53(20) kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
0.272	Tc	+ IV 0	Technetium dioxide Technetium	TcO₂ + 4 H⁺ ⇄ Tc + 4 H₂O	+ 4 e^-
0.472	Tc	+ VII 0	Pertechnate; technate(VII) anion Technetium	TcO₄^- + 8 H⁺ ⇄ Tc + 4 H₂O	+ 7 e^-
0.569	Tc	+ VII + VI	Pertechnate; technate(VII) anion Technate(VI) cation	TcO₄^- ⇄ TcO₄^2-	+ e^-
0.7	Tc	+ VII + VI	Pertechnate; technate(VII) anion Technetium trioxide	TcO₄^- + 2 H⁺ ⇄ TcO₃ + H₂O	+ e^-
0.738	Tc	+ VII + IV	Pertechnate; technate(VII) anion Technetium dioxide	TcO₄^- + 4 H⁺ ⇄ TcO₂ + 2 H₂O	+ 3 e^-
1.39	Tc	+ VI + IV	Technate(VI) cation Technetiumdioxid	TcO₄^2- + 4 H⁺ ⇄ TcO₂ + 2 H₂O	+ 2 e^-

Material and Physical Properties

Melting point2157 °CEnthalpy of fusion (molar)33.29 kJ mol^-1Boiling point4262 °CEnthalpy of vaporization585.22 kJ mol^-1Density11.5 g cm^-3 (25 °C)

External Data, Identifiers

CAS registry number7440-26-8InChI =1S/TcInChIKeyGKLVYJBZJHMRIY-UHFFFAOYSA-NPubChem ID23957

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Last update: 2022-12-12

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