Question

Postulates of Bohr's atomic model​

Answer 1

Answer:

• Bohr’s model of the hydrogen atom is based on three postulates:
• (1) an electron moves around the nucleus in a circular orbit,
• (2) an electron’s angular momentum in the orbit is quantized, and
• (3) the change in an electron’s energy as it makes a quantum jump from one orbit to another is always accompanied by the emission or absorption of a photon. Bohr’s model is semi-classical because it combines the classical concept of electron orbit (postulate 1) with the new concept of quantization

Answer 2

Answer:

Postulates of Bohr's atomic model

• Electron revolve around the nucleus in a fixed circular path termed as orbits or shells .
• An electron’s angular momentum in an orbit is quantized.
• The energy of an electron in a certain orbit remains constant. As long as it remains in that orbit, it neither  emits nor absorbs energy. These are termed as stationary states .
• When an electron jumps from a higher orbit to a lower orbit it releases energy in the form of radiations and when an electron jumps from lower orbit to a higher orbit it absorbs energy in the form of radiation.

Explanation:

1. Each orbit or shell has a fixed energy and these circular orbits are known as orbital shell.
2. Electron revolve around nucleus only in those orbits in which angular momentum L is an integral multiple of $\frac{h}{2\pi }$  i.e., angular momentum is quantized.
3. Electrons are revolving around nucleus in allowed orbits (stationary states) do not emit electromagnetic radiation and the total energy remains constant.
4. During transition between two stationary states ,energy can be absorbed or emitted or absorbed ,whose frequency is given by                         ν$=\frac{E_{I} - E_{f}}{h}$