An electron in a hydrogen atom makes a t...

An electron in a hydrogen atom makes a transition from `n = 2` to `n = 1` and emits a photon. This photon strikes a doubly ionized lithium atom which was already in an excited state and completely removes the orbiting electron. The least quantum number for the excitted state of the lithium-ion for the process is

`2`

`4`

`5`

`3`

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