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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 

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Atoms and ions which contains the same number of electrons are isoelectronic species.

GIven Ar  which has a total of 18 electrons.

Thus, the species having the same number of electrons are S_{2}^- ion having (16+2=18)electrons, or Cl^- having (17+1 =18) electrons, or K^+ ion (19-1=18) electrons, and Ca^{2+} ion having (20-2=18) electrons.

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Divya Prakash Singh

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