${C a}^{2 +}$ is isoelectronic with ?

{M g}^{2 +}

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K r

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A r

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{N a}^{+}

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Solution

The correct option is C $A r$
Isoelectronic species are those which have same no. of electrons.
No. of electrons in $C a = 20$
No. of electrons in ${C a}^{+ 2} = 18$
As ${C a}^{+ 2}$ contains 18 electrons, all those species containing 18 electrons will be isoelectronic with ${C a}^{+ 2}$ .
Argon is a noble gas and has 18 electrons. Hence, argon $(A r)$ is isoelectronic with ${C a}^{+ 2}$ .

Answer is option $C$ .

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