3.11 What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.
(ii) Ar
Atoms and ions which contains the same number of electrons are isoelectronic species.
GIven which has a total of 18 electrons.
Thus, the species having the same number of electrons are ion having electrons, or having electrons, or ion electrons, and ion having electrons.