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Question

What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.
(i) F (ii) Ar (iii) Mg2+ (iii) Rb+

Solution
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Isoelectronic species contain same number of electrons.
(i) Both F and O2 contain 10 electrons each. Hence, they are isolectronic.
(ii) Both Ar and Cl contains 18 electrons each. Hence, they are isoelectronic.
(iii) Both Mg2+ and Na+ contain 10 electrons each. Hence, they are isoelectronic.
(iv) Both Rb+ and Kr contain 36 electrons. Hence, they are isoelectronic.

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