Select the species which are isoelectronic.

F^{-}, M g^{2 +}

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A r, K

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M g^{2 +}, O^{-}

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R b^{+}, A r

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Solution

The correct option is D $F^{-}, M g^{2 +}$
Isoelectronic species have same number of electrons.
$F^{-}$ have 10 electron and $M g^{+} 2$ have have also 10 electron so they are isoelectronic species.

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F^{-}

A r

{M g}^{2 +}

{R b}^{+}

\begin{matrix} C l^{-}, A r, K^{+}, O^{2 -}, M g^{2 +}, F^{-} \end{matrix}

C a^{2 +}

Which of the following are isoelectronic species i.e., those having the same number of electrons?

Na⁺, K⁺, Mg²⁺, Ca²⁺, S^2–, Ar

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) $M g^{2 +}$

(iv) $R b^{+}$

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

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