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The point is scientists say that the electron is revolving in the orbit and the energy required for such revolution is very very small. They are also say that electron is not loosing enery


I think this picture of the electron is a bit out of date. If you think of the electron in terms of a standing wave that fits exactly in the spherical shell that symbolizes the energy level it occupies, then you can explain why no energy is lost, and why the electron does not spiral into the oppositely charged nucleus.

There never was nothing.