The difference between the radii of 3rd and 4th orbits of Li2+ is R1 . The difference between the radii of 3rd and 4th orbits of He+ is $\Delta $R2 . Ratio $\Delta $R1 : $\Delta $R2 is :

Question

The difference between the radii of 3^rd and 4^th
orbits of Li²⁺ is R₁ . The difference between the
radii of 3^rd and 4^th orbits of He⁺ is $\Delta $R₂ .
Ratio $\Delta $R₁ : $\Delta $R₂ is :

8 : 3