Question

The ionic radius of $N{a}^{+}$ ions is $1.02\mathring{A}$. The ionic radii (in $\mathring{A}$ ) of $M{g}^{2+}$ and $A{l}^{3+}$, respectively, are-

• A. 1.05 and 0.99
• B. 0.72 and 0.54
• C. 0.85 and 0.99
• D. 0.68 and 0.72

Answer 1

Answer: (B)

The ionic radii order is

$N{a}^{+}>M{g}^{2+}>A{l}^{3+}$