*Bohr' postulates are following :**
(i) Atom is spherical whose central part is positively charge called nucleus. The charge on nucleus is + ve, where Z is atomic no. and e is electronic charge
(ii) Electron moves.around the nucleus in circular orbits and they do not emit energy.
(iii) The electrostatic force between nucleus and electron provided it necessary centripetal force.i.e.,
(iv) Electrons moves those obrit whose angular momentum is integral multiple of h/2π
(v) When electron goes from heigher orbit to lower orbit,there is emmission of energy but when it goes from lower to heigher orbit, energy is observed in term of photons.
