$(a)$ Write two drawbacks of Rutherford's model of an atom.
$(b)$ State Bohr's postulates to overcome the drawbacks of Rutherford's model.

(N/A) $(i)$ The major drawback of Rutherford's model was its inability to explain the stability of an atom. According to classical electromagnetic theory,any charged particle in a circular orbit would undergo acceleration and radiate energy. Thus,the revolving electron would continuously lose energy and eventually spiral into the nucleus,making the atom unstable.
$(ii)$ It could not explain the electronic structure of atoms or the origin of line spectra.
$(b)$ Bohr's postulates to overcome these drawbacks:
$(i)$ Electrons revolve around the nucleus only in certain special orbits known as discrete or stationary orbits.
$(ii)$ While revolving in these discrete orbits,the electrons do not radiate energy.