Assuming the validity of Bohr's atomic model for hydrogen like ions the radius of Li ++ ion in its ground state is given by 1/X a 0 , where X= -. (Where a 0 , is the first Bohr's radius.)

Physics · Atomic Physics

JEE Main 2025 — 2 April, Evening Shift — Question 63

Assuming the validity of Bohr's atomic model for hydrogen like ions the radius of

$\mathrm{Li}^{++}$ ion in its ground state is given by $\frac{1}{X} a_{0}$ ,

where $X=$ $\qquad$ -. (Where $a_{0}$ , is the first Bohr's radius.)

$r=\frac{a_{0} n^{2}}{z}$

$\therefore \quad r_{\mathrm{Li}}(n=1)=\frac{a_{0}(1)}{3}$

$\therefore \quad X=3$

Answer key and solution verified before publishing.

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