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Q.

Identify those which are isosteric with each other:

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a

${Na}^{+}$

b

${Al}^{+ 3}$

c

$O^{2 -}$

d

${Mg}^{2 +}$

answer is A, B, C, D.

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Detailed Solution

The electronic configuration of all the given elements is,

$1 s^{2} 2 s^{2} 2 p^{6}$

Thus, each are isosteric with each other:

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Identify those which are isosteric with each other: