question_answer 19)

  The simple Bohr model can not be directly applied to calculate the energy levels of an atom with many electrons. This is because (a) of the electrons not being subject to a central force (b) of the electrons colliding with each other (c) of screening effects (d) the force between the nucleus and an electron will no longer be given by Coulomb's law

Answer:

  The simple Bohr model cannot be directly applied to calculate energy levels of an  atom with many electrons. This is because all the electrons in the atom are not being subjected to one single central force. Choice (a) is correct