Question

Write down two limitations of Bohr’s model of atom.

Answer 1

The atomic model of Niels Bohr was an important step towards the atomic world. It mainly focuses on the energy consumption and rejection by electrons to go from lower energy levels to higher energy levels and vice versa.

Complete answer:
One of the main limitations of Niels Bohr’s atomic model was that his atomic model was violating the uncertainty principle of Heisenberg. According to the atomic model prepared by Niels Bohr, the electrons have both a known radius and known orbit.
This means that the position and the momentum of an electron can be found simultaneously, but this is not in agreement with the uncertainty principle of the Heisenberg principle. Thus, this was one of the main limitations of the atomic model of Niels Bohr.
Another main limitation of the atomic model of Niels Bohr was that he failed to explain how an electron revolves around the nucleus without losing any energy.
He failed to explain how an electron does not lose its energy in the form of electromagnetic radiation while revolving and how it does not spiral into the nucleus. Thus, this is also one main limitation of the atomic model made by Niels Bohr.
Therefore, these two are the main two limitations of the atomic model of Niels Bohr. There are other limitations like the atomic model of Niels Bohr is more supportive towards smaller atoms like hydrogen and helium, it does not support much from bigger atoms.

Note:
The other limitations of the atomic model of Niels Bohr are that the model failed to explain Zeeman effect when the spectral line is split into several components in the presence of a magnetic field. It also failed to explain the stark effect when the spectral line gets split up into fine lines in the presence of an electric field.