To calculate the energy of stationary states of electrons in atoms with more than one electron, Bohr's theory cannot be modified in principle, if only because it is based on the study of the mechanical energy of electrons moving along closed trajectories. The main drawback of Bohr's theory is considered to be its inability to explain the properties of more complex atoms. Even the problem of the energy levels of the helium atom has not been solved. When an electron moves along closed orbits, electrodynamics assumes continuous emission of an electron and its fall onto the nucleus, that is, it assumes the instability of atoms.
