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The difference between the radii of 3rd and 4th orbits of Li$^{2+}$ is $\Delta R_1$. The difference between the radii of 3rd and 4th orbits of He$^+$ is $\Delta R_2$. Ratio $\Delta R_1 : \Delta R_2$ is:
(1). (8 : 3)
(2). (3 : 8)
(3). (2 : 3)
(4). (3 : 2)
$\Delta R_1 / \Delta R_2 = (Z_{He^+}) / (Z_{Li^{2+}}) = 2/3$.
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