Question

The set representing the correct order of ionic radius is-

• A. Na⁺ > Li⁺ > Mg²⁺ > Be²⁺
• B. Li⁺ > Na⁺ > Mg2⁺ > Be²⁺
• C. Mg²⁺ > Be²⁺ > Li⁺ > Na⁺
• D. Li⁺ > Be²⁺ > Na⁺ > Mg²⁺

Answer 1

Answer: (A)

Explanation:

• The ionic radii of alkali metal ions are larger than those of alkaline earth metal ions belonging to the same period.
• Also, the ionic radii increases down the group and decreases as we move across a period.
• Hence, the correct order of the ionic radii is​ $N{a}^{+}>L{i}^{+}>M{g}^{2+}>B{e}^{2+}$

Hence, option (B) is correct.