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NEET UG CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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The correct ionic radii order is:
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Correct option: A
N3−>O2−>F−>Na+>Mg2+>Al3+{\mathrm{N}^{3 - }} > {\mathrm{O}^{2 - }} > {\mathrm{F}^ - } > N{\mathrm{a}^ + } > M{\mathrm{g}^{2 + }} > A{\mathrm{l}^{3 + }}
Option A (N3−>O2−>F−>Na+>Mg2+>Al3+{\mathrm{N}^{3 - }} > {\mathrm{O}^{2 - }} > {\mathrm{F}^ - } > N{\mathrm{a}^ + } > M{\mathrm{g}^{2 + }} > A{\mathrm{l}^{3 + }}) is correct because it correctly orders the isoelectronic species based on their nuclear charge; higher the nuclear charge, smaller the ionic radii.

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