What are some examples of isoelectronic elements

As isoelectronic we call two atoms, ions, or molecules when they have the same number of electrons and a very similar electron configuration, even though they are made up of different elements.

Physical and chemical properties can be similar for isoelectronic compounds. However, since the total charge and the charge distribution of isoelectronic compounds often differ significantly from one another, properties that are particularly strongly influenced by this are less similar than others that are less influenced by it (cf. isosteria). The term is a little broader "iso-valence electronic". Here only the valence shell has to be constructed in the same way and filled with the same number of electrons.
Some isoelectronic or isovalentelectronic compounds, for example, have very similar qualities as ligand / "Lewis base" in complex compounds, see Ex. 3 and 7.



  • O2- - F- - No - Well+
  • HF - OH- - NH2-
  • CO - CN- - NO+ - N2

Iso-valence electronic:

  • O2- - Cl- - Ne - K+
  • CCl4 - SiCl4 - AlCl4- - PBr4+
  • H2SO4 - H2S.2O3 - H2PO4-
  • [Mo (CO)6] - [V (CO)6]- - [Fe (CN)6]4-

see also: Isolobal, Isosterie

Categories: Organic Chemistry | Inorganic chemistry