The difference between 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 $\Delta R_2$. Ratio $\Delta R_1: \Delta R_2$ is
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