Correct Answer: Option C

Explanation

Two or more ions are said to be isoelectronic if they have the same electronic structure and the same number of valence electrons.

Na\(^+\) = 10 electrons = 2, 8

Mg\(^{2+}\) = 10 electrons = 2,8

O\(^{2-}\) = 10 electrons = 2,8

Si\(^{2+}\) = 12 electrons = 2,8,2

\(\implies\) Si\(^{2+}\) is not isoelectronic with the rest.

There is an explanation video available below.

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