Question

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

• A. $H^{-}$
• B. $H$
• C. $H{e}^{+}$
• D. $L{i}^{2+}$

Answer 1

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.