Title: Energies in a hydrogen atom

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Q: An electron in the innermost shell of a hydrogen atom (n=[...]) has a binding energy of [...]. To remove this electron a external excitation energy that is greater than this [...] is needed. If the electron resides in a shell further from the nucleus the binding energy and thus the required external [...] reduces.
A: 1; -13.6 eV; binding energy; excitation energy