JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Which pair of ions are isoelectronic?

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Correct option: D

\mathrm{Na}^{+}

and

\mathrm{Mg}^{2+}

Option D (

\mathrm{Na}^{+}

and

\mathrm{Mg}^{2+}

) is correct because both ions have 10 electrons, making them isoelectronic.

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\mathrm{O}, \mathrm{O}^{2-}, \mathrm{F}

\mathrm{F}^{-}