Hey experts..plss explain that " why electrons do not lose or gain energy when in revolving orbits according to bohr model ...why they could radiate energy in rutherford model? ..what is the diff in orbits of both model that one allows to radiate energy and other do not?

Dear student,
 

According to Rutherford’s model of the atom, The electrons revolve around the nucleus in well-defined orbits. but it has a drawback: The orbital revolution of the electron is not expected to be stable. Any particle in a circular orbit would undergo acceleration. During acceleration, charged particles would radiate energy. Thus, the revolving electron would lose energy and finally fall into the nucleus. If this were so, the atom should be highly unstable, and hence matter would not exist in the form that we know. We know that atoms are quite stable.

so to correct this model Bohr's model came into account according to which:

(i)Only certain special orbits known as discrete orbits(energy levels) of electrons, are allowed inside the atom.(ii) While revolving in discrete orbits the electrons do not radiate energy.

Energy level diagram of an atom

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