# The radius of the second Bohr orbit,

Question:

The radius of the second Bohr orbit, in terms of the Bohr radius, $\mathrm{a}_{0}$, in $\mathrm{Li}^{2+}$ is :

1. $\frac{4 \mathrm{a}_{0}}{9}$

2. $\frac{2 a_{0}}{9}$

3. $\frac{2 \mathrm{a}_{0}}{3}$

4. $\frac{4 \mathrm{a}_{0}}{3}$

Correct Option: , 4

Solution: