To which of the following species, the Bohr theory is not applicable?

H e

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{L i}^{2 +}

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{H e}^{2 +}

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H

-atom

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Solution

The correct options are
A $H e$
C ${H e}^{2 +}$
The Bohr theory is not applicable to the species $H e$ and $H e^{2 +}$ as these are not one electron species. $H e$ and $H e^{2 +}$ contains 2 and 0 electrons respectively.
The Bohr theory is applicable to the species $L i^{2 +}$ and H atom as these are one electron species.

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