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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Correct order of

{Z}_{\text {eff }}

for species

\mathrm{Na}^{+}, {Mg}^{2+}, {Al}^{3+}

View answer and explanation

Correct option: B

{Na}^{+} < {Mg}^{2+} < {Al}^{3+}

Option B (

{Na}^{+} < {Mg}^{2+} < {Al}^{3+}

) is correct because for isoelectronic species, the effective nuclear charge increases with increasing nuclear charge, leading to a smaller ionic radius and greater effective nuclear charge.

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