Question

What are the main postulates of bohr's theory of an atom?

Answer 1

The important postulates in his theoryare, Electrons revolve round the nucleus with definite velocities in concentric circular orbits situated at definite distances from the nucleus. ...Bohr proposed that the angular momentum of an electron is quantized

Answer 2

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Bohr model postulates that electrons orbit the nucleus at fixed energy levels.

Orbits further from the nucleus exist at higher energy levels.

When electrons return to a lower energy level, they emit energy in the form of light.