Radius of the K-shell in Li⁺² is

For Li⁺²

n=k shell=1

z=3

${\mathrm{r}}_{\mathrm{n}}={\mathrm{n}}^2\times \frac{0.526}{\mathrm{z}}\stackrel{\mathrm{o}}{\mathrm{A}}$

$1^2\times \frac{0.529}{3}=0.176 \stackrel{\mathrm{o}}{\mathrm{A}}$

$\therefore \mathrm{Radius} \mathrm{of} \mathrm{the} \mathrm{K} \mathrm{shell} \mathrm{in} {\mathrm{Le}}^{+2} \mathrm{is} 0.176 \stackrel{\mathrm{o}}{\mathrm{A}}$