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The simple Bohr model is not applicable ...

The simple Bohr model is not applicable to `He^(4)` atom because

A

`He^(4)` is an inert gas

B

`He^(4)` has neutrons in the nucleus.

C

`He^(4)` has one more electron.

D

electrons are not subjected ot central forces.

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The correct Answer is:
C, D
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