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The group having isoelectronic species is :

$\begin{array}{1 1} (1) O^{2−}, F^{−}, Na, Mg^{2+} \\ (2) O^{−}, F{−}, Na^{+}, Mg^{2+} \\ (3) O^{2−}, F^{−}, Na, Mg^{2+} \\ (4) O^{−}, F^{−}, Na, Mg^{+} \end{array} $

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