Question

Discuss in brief the Bohr's model of atom.

Answer 1

Neils Bohr came up with his atomic theory known as Bohr's model of the atom in 1915. Bohr's model of the atom was a modified version of Rutherford's atomic model.

The main postulates of Bohr's model of the atom are as follows:

1. Bohr fixed the path of orbiting electron i.e. in an atom electron revolves around a positively charged nucleus in a fixed path called the orbit.
2. Each orbit or shell has fixed energy in which the electron is revolving.
3. The energy level of orbitals is represented by natural numbers i.e. n = 1, 2, 3…… known as a quantum number.
4. The electron in an atom jumps from one orbit to another orbit by gaining or losing energy.

Limitations of Bohr's model of the atom :

1. It could not explain spectra obtained from large atoms.
2. Bohr's model of the atom is unable to explain the Stark effect and Zeeman effect.
3. Bohr's model of the atom is violating Heisenberg's uncertainty principle.