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

of screening effects

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the force between the nucleus and an electron will no longer be given by Coulomb's law.

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of the electrons not being subject to central force

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of the electrons colliding with each other.

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Solution

The correct option is C of the electrons not being subject to central force
Solution: The Bohr model cannot be applied to measure the energy levels of atoms having several electrons as from the Bohr model only the magnitude of the angular momentum of revolving electrons can be obtained. But, electrons are not being subjected to the central force.
Hence, the correct option is (C).

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