Question

can anyone tell me about the failures of Bohr model??

Answer 1

1. Bohr treated electrons as particles where according to de Broglie's hypothesis, having a very low mass, electron also exhibits wave nature.

2. Bohr's model was adequate only for nucleus having only one electron
e.g. Hydrogen, He+1, Li+2 etc.
Bohr's model could not explain the spectra of multi-electronic atoms.

3. Bohr's model was two-dimensional where an atom is three-dimensional.

4. Using a better spectrometer, the spectra showed very fine lines. Bohr's model could not explain the origin of those fine lines.

5. Bohr's model could not explain the effect electric field and magnetic field on spectra. (Stark effect and Zeeman effect)

6. In Bohr's equation, the momentum and position of electron, revolving around the nucleus were well defined. But, according, Heisenberg's Uncertainty principle, it is impossible to measure the position and momentum of electrons precisely. If the position is measure with maximum precision, there will be uncertainty in the value of momentum and vice versa.

Answer 2

hi
these are some failures of bohr model
1.This theory could not explain the presence of multiple spectral lines.

2. 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.

3.This theory was unable to explain of dual nature of matter as explained on the basis of De broglies concept.

4. This theory could not explain uncertainty principle.

5.No conclusion was given for the concept of quantisation of energy.

hope it helps ☺if helped then plz follow me