1.

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

Answer»

of the electrons not being subject to a central force
of the electrons colliding with each other
of screening effects
the force between the nucleus and are electron will no longer be given by COULOMB's law.

Solution :Because in an atom having many electrons, alongwith the Colombian force exerted on a given electron by nucleus, other electrons also provide variable Colombian FORCES on a given electron and so resultant Colombian force exerted on it does not remain central force. Hence, simple Bohr MODEL is not APPLICABLE in this CASE.


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