Technetium

Chemical, physical and material properties and data of the chemical element Technetium.

Content

General data

Atomar properties

Electron configutation

General Information about Technetium

Regular nameTechnetiumChemical symbolTcOther namesSystematic nameHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Technetium

Atomic number Z43 = number of protonsStandard Atomic Weight98.9062547 (21)

Electron configuration of Technetium

1s	2s	2p	3s	3p	3d	4s	4p	4d	4f	5s	5p	5d	5f	6s	6p	6d	6f	7s	7p
2	2	6	2	6	10	2	6	6		1

Abbreviated form: [Kr] 4d⁶ 5s¹ .

Ionization Energies of Technetium

The following table lists the ionization energies IE (ionization potentials); the IE is the energy required in electron volts (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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