Recall that in the Bohr model, the exact path of the electron was restricted to very well-defined circular orbits around the nucleus. When the circumference of the circle does not allow an integer number of wavelengths, bottom, the resulting destructive interference results in cancellation of the wave. But the repulsions of electrons are taken into account somewhat by the phenomenon of screening. Categories : Atomic physics Foundational quantum physics Hydrogen physics Niels Bohr in science. The location of the electrons in the quantum mechanical model of the atom is often referred to as an electron cloud. The electrons in outer orbits do not only orbit the nucleus, but they also move around the inner electrons, so the effective charge Z that they feel is reduced by the number of the electrons in the inner orbit. Guilherme Volpato.