The difference between the radii of

Question:

The difference between the radii of $3^{\text {rd }}$ and $4^{\text {th }}$ orbits of $\mathrm{Li}^{2+}$ is $\Delta \mathrm{R}_{1}$. The difference between the radii of $3^{\text {rd }}$ and $4^{\text {th }}$ orbits of $\mathrm{He}^{+}$is $\Delta \mathrm{R}_{2}$. Ratio $\Delta \mathrm{R}_{1}: \Delta \mathrm{R}_{2}$ is :

  1. $8: 3$

  2. $3: 2$

  3. $3: 8$

  4. $2: 3$


Correct Option: , 4

Solution:

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