Correct Answer: Option A

Explanation

\(_{17}\)Cl\(^-\) = 18 electrons = 2, 8, 8

\(_{12}\)Mg\(^{2+}\), \(_{8}\)O\(^{2-}\) and \(_{13}\)Al\(^{3+}\) all have 10 electrons = 2, 8.

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