(C) Isoelectronic species are those that have the same number of electrons.$Na^{+}$ ($11-1 = 10$ electrons)$Mg^{2+}$ ($12-2 = 10$ electrons)$F^{-}$ ($

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$Na^{+}, Mg^{2+}, F^{-}, O^{2-}$

(C) Isoelectronic species are those that have the same number of electrons.$Na^{+}$ ($11-1 = 10$ electrons)$Mg^{2+}$ ($12-2 = 10$ electrons)$F^{-}$ ($9+1 = 10$ electrons)$O^{2-}$ ($8+2 = 10$ electrons)Since $Na^{+}, Mg^{2+}, F^{-},$ and $O^{2-}$ all contain $10$ electrons,they are isoelectronic.Therefore,option $(c)$ is correct.