Failure of Bohr Model
Bohr theory was very successful in predicting and accounting the energies of line spectra of hydrogen i.e. one electron system. It could not explain the line spectra of atoms containing more than one electron.
(ii) This theory could not explain the presence of multiple spectral lines.
(iii) This theory could not explain the splitting of spectral lines in magnetic field (Zeeman effect) and in electric field (Stark effect). The intensity of these spectral lines was also not explained by the Bohr atomic model.
(iv) This theory was unable to explain of dual nature of matter as explained on the basis of De broglies concept.
(v) This theory could not explain uncertainty principle.
(vi) No conclusion was given for the concept of quantisation of energy.