JEE MAIN - Chemistry (2021 - 25th July Morning Shift - No. 9)

The ionic radii of K⁺, Na⁺, Al³⁺ and Mg²⁺ are in the order:

Na⁺ < K⁺ < Mg²⁺ < Al³⁺

Al³⁺ < Mg²⁺ < K⁺ < Na⁺

Al³⁺ < Mg²⁺ < Na⁺ < K⁺

K⁺ < Al³⁺ < Mg²⁺ < Na⁺

Explanation

Al³⁺, Mg²⁺ and Na⁺ are isoelectronic ionic species. For monoatomic ionic isoelectronic species as positive charge increases ionic size decreases.

The order of size of Na⁺ & K⁺ is Na⁺ < K⁺

$$\therefore$$ Order of ionic radii is : Al³⁺ < Mg²⁺ < Na⁺ < K⁺

JEE MAIN - Chemistry (2021 - 25th July Morning Shift - No. 9)

Explanation

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