Question

Limitations of bohr model (11 class)

Answer 1

Explanation:

->Bohr’s model doesn’t work well for complex atoms.

->It couldn’t explain why some spectral lines are more intense than others.

->It could not explain why some spectral lines split into multiple lines in the     presence of a magnetic field.

->The Heisenberg’s uncertainty principle contradicts Bohr’s idea of electrons        existing in specific orbits with a known radius and velocity.

Answer 2

It violates the Heisenberg Uncertainty Principle. The Bohr atomic model theory considers electrons to have both a known radius and orbit i.e. known position and momentum at the same time, which is impossible according to Heisenberg.

The Bohr atomic model theory made correct predictions for smaller sized atoms like hydrogen, but poor spectral predictions are obtained when larger atoms are considered.

It failed to explain the Zeeman effect when the spectral line is split into several components in the presence of a magnetic field.

It failed to explain the Stark effect when the spectral line gets split up into fine lines in the presence of an electric field.

Hope it helps ...