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Q. Using Bohr’s formula for energy quantization, the ionisation potential of the ground state of $Li^{++}$ atoms is

Atoms

Solution:

Energy in a shell of an atom is given by
$E=E_{0} \frac{Z^{2}}{n^{2}} $
$E_{L}=13.6 \times 9$
or $ \approx 122\, V$