Na⁺, Mg²⁺, Al³⁺ and Si⁴⁺ ions are isoelectronic. The value of ionic radii of these ions would be in the order :
(a) Na⁺ > Mg²⁺ > Al³⁺ > Si⁴⁺
(b) Na⁺ < Mg²⁺ < Al³⁺ < Si⁴⁺
(c) Na⁺ > Mg²⁺ > Al³⁺ < Si⁴⁺
(d) Na⁺ < Mg²⁺ > Al³⁺ > Si⁴⁺
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(a) is the correct..
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