Talha's Physics Academy

Postulates of Bohr's Atomic Model

Postulates of Bohr's Atomic Theory

The important postulates of Bohr's atomic theory are as follows:

Circular Orbits: In an atom, negatively charged electrons revolve around the positively charged nucleus in definite circular paths called orbits or shells.
Stationary Energy States: Each orbit or shell has a fixed energy, and these circular orbits are known as stationary orbital shells.
Quantization of Angular Momentum: Electrons revolve only in those specific orbits for which their orbital angular momentum is an integral multiple of $\frac{h}{2\pi}$.
$L = mvr = \frac{nh}{2\pi}$ (where $n = 1, 2, 3, \dots$)
Energy Transitions: The electrons in an atom move from a lower energy level to a higher energy level by gaining the required energy, and an electron moves from a higher energy level to a lower energy level by losing energy.

Fig: Bohr's model representing quantized orbits and electron energy level transitions.