The simple Bohr model cannot be directly applied to calculate the energy levels of an atom with many electrons. This is because

Options

A. of the electrons not being subjected to a central force
B. of the electrons colliding with each other
C. of screening effects
D. the force between the nucelus and an electron will no longer be given by Coulomb's law

Answer

A

Explanation

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 atoms are not being subjected to one single central force. Choice (a) is correct.