Dear Student,
Electrons do not radiate on discrete objects because Neil Bohr has later told that the electrons are fixed in their orbits according to their energy levels and the electrons shift from the lower energy level orbits to higher energy level orbits to gain energy n the electrons which r situated in the higher enegy level orbits shift to lower to loose energy. Like this way the electrons keep on shifting from one orbit to other and hence the electrons do not loose energy as thay loose n gin energy by this shifting process.
Regards