JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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The correct order of the ionic radii of

{O^{2 - }},\,{N^{3 - }},\,{F^ - },\,M{g^{2 + }},\,N{a^ + }\,

and

A{l^{3 + }}

View answer and explanation

Correct option: C

A{l^{3 + }} < M{g^{2 + }} < N{a^ + } < {F^ - } < {O^{2 - }} < {N^{3 - }}

Option C (

Al^{3+} < Mg^{2+} < Na^+ < F^- < O^{2-} < N^{3-}

) is correct because for isoelectronic species, ionic radii decrease with increasing nuclear charge.

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