JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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The correct order of the decreasing ionic radii among the following is electronic species are

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Correct option: C

{S}^{2-} > {Cl}^{-} > {K}^{+} > {Ca}^{2+}

Option C (S2- > Cl- > K+ > Ca2+) is correct because, for isoelectronic species, ionic radii decrease with increasing nuclear charge (more protons).

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\mathrm{F}^{-}