Question

give the main postulates of Bohr's model of an atom

Answer 1

NUCLEAR CONCEPT:
An atom consists of small and massive central core, called as the nucleus, around which planetary electrons revolve. The centripetal force required for their revolution around the atom’s nucleus is provided by the electrostatic force of attraction between the nucleus and the electron.



QUANTUM CONDITION:
Of all the possible circular orbits allowed by the classical theory, the electrons are allowed to revolve only in those orbits in which, the angular momentum of the electron is an integral multiple of h/2pi. This is Bohr’s famous quantum condition.



STATIONARY ORBITS:
An electron does not radiate energy, while revolving in a permissible orbits. These permissible, non - radiating orbits are called as stationary orbits.FREQUENCY CONDITION:
An electron can absorb or emit radiation in the form of discrete energy photons only when it jumps from a lower energy orbit to a higher energy orbit or from a higher energy orbit to a lower energy orbit, respectively. This is Bohr’s famous frequency condition.