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) Mg $^{2 +}$ (iii) Rb $^{+}$

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Solution

Isoelectronic species contain same number of electrons.
(i) Both $F^{-}$ and $O^{2 -}$ contain 10 electrons each. Hence, they are isolectronic.
(ii) Both $A r$ and $C l^{-}$ contains 18 electrons each. Hence, they are isoelectronic.
(iii) Both $M g^{2 +}$ and $N a^{+}$ contain 10 electrons each. Hence, they are isoelectronic.
(iv) Both $R b^{+}$ and $K r$ contain 36 electrons. Hence, they are isoelectronic.

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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⁺

(iv) Rb⁺

O^{2 -}, F^{-}, N a^{+}, M g^{2 +}

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i) N e i i) O^{2 -} i i i) M g^{2 +} i v) F

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