Question

state and explain bohr's postulate of Hydrogen atom​

Answer 1

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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.

(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.

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Answer 2

Bohr's postulate of hydrogen atom:-

1. Atom consists of a positively charged nucleus in the center and electrons revolve around it in circular orbits.

2. Electrons revolve only in those orbits that have fixed energy levels called stationary states.

3. The value of angular momentum of an electron is also discrete and is given by the expression, mvr = nh/2π

4. The lowest energy state of electrons is called their ground state.

5. Energy is emitted if an electron jumps from a higher energy level to a lower energy level and gains energy while transiting from a lower to a higher state.