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Question

The simple Bohr model is not applicable to He4 atom because

A
electrons are not subject to central forces.
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B
He4 has one more electron.
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C
He4 is an inert gas.
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D
He4 has neutrons in the nucleus
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Solution

The correct option is B He4 has one more electron.

Bohr proposed a model for hydrogen atom which is also applicable for some lighter atoms in which a single electron revolves around a stationary nucleus of positive charge Ze (called hydrogen like atom). It is valid only for one electron atoms, e.g.:H,H+,Li+2,Na+1 etc. So when we look carefully at He4, then it has one more electron i.e., total 2 electrons. That is not possible in Bohr model. And electrons are not subjected to central forces.

Final Answer: (c), (d)

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