Assertion (A) : The Bohr model is not applicable to atoms having many electrons.
Reason (R) : In atoms having many electrons, each electron interacts not only with positively charged nucleus but also with all other electrons.

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Both assertion and reason are true and reason is correct explanation of assertion

Assertion is true and reason is false

Assertion is false and reason is true

Both assertion and reason are true but reason is not correct explanation of assertion

answer is A.

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Detailed Solution

In Bohr atomic model we consider the electrons as entities which interact only with the nucleus and not with the other electrons around them. Hence while calculating X ray frequency using Bohr energy formula, equation takes into consideration the screening effect which is very dominant in heavy elements .

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