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 $X=$ $\_\_\_\_$ (Where $a_{0}$ is the first Bohr's radius.)
Select the correct option:
A
1
B
3
C
2
D
9
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
$\quad r=r_{0} \frac{n^{2}}{z} \& z=3$ for $L i^{+2}$ and $n=1$
$\therefore r=r_{0} \frac{1^{2}}{3}=\frac{r_{0}}{3} \quad \therefore x=3$
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