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(C) When an electron transitions to the $n=2$ energy level (Balmer series),it is in an excited state if $n > 2$. Eventually,the electron must transiti

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It must emit another photon in the Lyman series.

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(C) When an electron transitions to the $n=2$ energy level (Balmer series),it is in an excited state if $n > 2$. Eventually,the electron must transition to lower energy levels to reach the ground state $(n=1)$. Transitions to the $n=1$ level result in the emission of photons in the Lyman series. Therefore,after emitting a photon in the Balmer series,the electron will eventually transition to the ground state,emitting a photon in the Lyman series.

Whenever a hydrogen atom emits a photon in the Balmer series,

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