Question

The correct sequence which shows decreasing order of the
ionic radii of the elements is
(a) Al³⁺ > Mg²⁺ > Na⁺ > F⁻ > O²⁻
(b) Na⁺ >Mg²⁺ > Al³⁺ > O²⁻ > F⁻
(c) Na⁺ > F⁻ > Mg²⁺ > O²⁻ > Al³⁺
(d) O²⁻ > F⁻ > Na⁺ >Mg²⁺ > Al³⁺

Answer 1

Answer:

(d) O²⁻ > F⁻ > Na⁺ >Mg²⁺ > Al³⁺

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Answer 2

answer : option (d) O²⁻ > F⁻ > Na⁺ >Mg²⁺ > Al³⁺

in a group of isoelectronic species, ionic radii decrease with increasing positive charge. because by increasing positive charge , increase effective nuclear charge. and we know, radius is inversely proportional to effective nuclear charge.

[ isoelectronic are those ions which have same number of electrons ]

here Al³⁺ , Mg²⁺, Na⁺ , F⁻ and O²⁻ all have same number of electrons.

so order of ionic radii will be ,

Al³⁺ < Mg²⁺ < Na⁺ < F⁻ < O²⁻

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