JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Which of the following is arranged in decreasing order of size?

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Correct option: B

\mathrm{O}^{2-} > \mathrm{Mg}^{2+} > \mathrm{Al}^{3+}

Option B (

\mathrm{O}^{2-} > \mathrm{Mg}^{2+} > \mathrm{Al}^{3+}

) is correct because for isoelectronic species, the ionic radius decreases with increasing nuclear charge (atomic number).

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

\mathrm{F}^{-}