Question

What will be the ratio between the radius of $3^{r}d$ shell of $L{i}^{+2}$ & radius of $3^{rd}$ shell of the hydrogen atom?

Answer 1

Ratio of radius of $3^{rd}$ shell of $L{i}^{+2}$ and $3^{rd}$ shell of hydrogen atom $=\frac{n^2/2}{n^2/2}$

$=\frac{3^2/3}{3^2/1}$

$=\frac{1}{3}$.