Question

Write any 3 postulates of Bohr's Model and Also write Limitation of Bohr's Model.​

Answer 1

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Postulates of Bohr's Model :-

1. First Postulate :-

Atom has a nucleus where all protons and neutrons are present.

The size of Nucleus is very small and it is present at the centre of the atom.

2. Second Postulate :-

The orbit in which electron can revolve are known as stationary orbits because in these orbits energy of electron is always constant.

3. Third Postulate :-

Each stationary orbits is associated with definite amount of energy therefore these orbit are also called Energy levels and are numbered as 1,2,3,4....... or K,L,M,N......from the nucleus outwards.

━━━━━━━━━━━━━━━━━━━━━━━━━━

Limitations of Bohr's Model :-

• Bohr's theory does not explain the spectrum of multiple Atoms.

• Why the Angular Momentum of the revolving electron is equal to $\sf{\frac{nh}{2π}}$ ,has not been explained

• Bohr inter related Quantum theory of radiation and classical law of Physics without any theoritical explanation .

• Bohr's theory does not explain the fine structure of the spectral line

Answer 2

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See the attachment!!