Question

define bohr postulates and limitations??

Answer 1

Postulates of Bohr model are-
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1. In an atom, the electrons revolve around the nucleus in certain definite circular paths called orbits, or shells.

2. Each shell or orbit corresponds to a definite energy. Therefore, these circular orbits are also known as energy levels or energy shells.

3. The orbits or energy levels are characterized by an integer

4. The electrons present in an atom can move from a lower energy level (Elower) to a level of higher energy (Ehigher) by absorbing the appropriate energy

Drawbacks of Bohr's model are-
1. It violates the Heisenberg Uncertainty Principle
2. 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.
3. It failed to explain the Zeeman effect when the spectral line is split into several components in the presence of a magnetic field.
4. It failed to explain the Stark effect when the spectral line gets split up into fine lines in the presence of electric field.
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Answer 2

Answer:

Limitations of Bohr's Model of an Atom

Bohr's model of an atom failed to explain the Zeeman Effect (effect of magnetic field on the spectra of atoms). It also failed to explain the Stark effect (effect of electric field on the spectra of atoms). It violates the Heisenberg Uncertainty Principle.

Explanation: