For which of the following species, Bohr theory does not apply?

H^{-}

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H

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H e^{+}

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L i^{2 +}

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Solution

The correct option is A $H^{-}$
One of the limitations of Bohr's atomic model is that it does not explain the spectra of multi-electron atoms. All these species like $H, H e^{+}$ and $L i^{2 +}$ are isoelectronic and have only one electron. Their electronic configurations are same and so their spectra is explained by Bohr's atomic model. But $H^{-}$ has 2 electrons.

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H^{+}

{H e}^{+}

{L i}^{+}

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L i^{2 +}

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