The energy of the second orbit of a hydrogen atom is $-5.45 \times 10^{-19} \ J$. What is the energy of the first orbit of $Li^{2+}$ ion (in $J$)?

If the radius and energy of the second Bohr orbit of a hydrogen atom are $r_2$ and $E_2$, respectively, then the radius and energy of the third Bohr orbit will be, respectively:

What is the shortest wavelength for the Paschen series of the $Li^{2+}$ ion?

Explain Bohr's atomic model.

Given below are two statements:
Statement $I$: Bohr's theory accounts for the stability and line spectrum of $Li^{+}$ ion.
Statement $II$: Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field.
In the light of the above statements,choose the most appropriate answer from the options given below:

Calculate the radius of the first orbit of $He^{+}$. (in $pm$)