Technetium: properties of free atoms

Technetium atoms have 43 electrons and the shell structure is  2.8.18.14.1.

The ground state electron configuration of ground state gaseous neutral technetium is  [Kr].4d6.5s1 and the term symbol is  6S5/2.

Atomic spectrum

 

A representation of the atomic spectrum of technetium.

Ionisation Energies and electron affinity

The electron affinity of technetium is 53 kJ mol‑1. The ionisation energies of technetium are given below.

Ionisation energies of technetium
Ionisation energy number Enthalpy / kJ mol‑1
1st702
2nd1470
3rd2850
Kossel shell structure of technetium
The Kossel shell structure of technetium.

Effective Nuclear Charges

The following are "Clementi-Raimondi" effective nuclear charges, Zeff. Follow the hyperlinks for more details and for graphs in various formats.

Effective nuclear charges for technetium
1s42.11  
2s31.63 2p38.94  
3s26.79 3p26.38 3d28.35  
4s17.20 4p15.81 4d12.88 4f(no data)
5s7.23 5p(no data) 5d(no data)  
6s(no data) 6p(no data)  
7s   

References

These effective nuclear charges, Zeff, are adapted from the following references:

  1. E. Clementi and D.L.Raimondi, J. Chem. Phys. 1963, 38, 2686.
  2. E. Clementi, D.L.Raimondi, and W.P. Reinhardt, J. Chem. Phys. 1967, 47, 1300.

Electron binding energies

Electron binding energies for technetium. All values of electron binding energies are given in eV. The binding energies are quoted relative to the vacuum level for rare gases and H2, N2, O2, F2, and Cl2 molecules; relative to the Fermi level for metals; and relative to the top of the valence band for semiconductors.
Label Orbital eV [literature reference]
K 1s21044 [1]
L I2s3043 [1]
L II2p1/22793 [1]
L III2p3/22677 [1]
M I3s544 [2]
M II3p1/2447.6 [2]
M III3p3/2417.7 [2]
M IV3d3/2257.6 [2]
M V3d5/2253.9 [2]
N I4s69.5 [2]
N II4p1/242.3 [2]
N III4p3/239.9 [2]

Notes

I am grateful to Gwyn Williams (Jefferson Laboratory, Virginia, USA) who provided the electron binding energy data. The data are adapted from references 1-3. They are tabulated elsewhere on the WWW (reference 4) and in paper form (reference 5).

References

  1. J. A. Bearden and A. F. Burr, "Reevaluation of X-Ray Atomic Energy Levels," Rev. Mod. Phys., 1967, 39, 125.
  2. M. Cardona and L. Ley, Eds., Photoemission in Solids I: General Principles (Springer-Verlag, Berlin) with additional corrections, 1978.
  3. Gwyn Williams WWW table of values
  4. D.R. Lide, (Ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 81st edition, 2000.
  5. J. C. Fuggle and N. Mårtensson, "Core-Level Binding Energies in Metals," J. Electron Spectrosc. Relat. Phenom., 1980, 21, 275.

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43 Tc
 Technetium
 Technétium
 Technetium
 Technetium
 Tecneto
 Tecnecio
 Teknetium
 Tecnécio

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