Final answer:
The peaks in the photoelectron spectrum represent different sub-energy levels: s, p, d, and f. Each sub-level can accommodate a specific number of electrons.
Step-by-step explanation:
The peaks in the photoelectron spectrum represent different sub-energy levels. The sub-energy levels are identified by the letters s, p, d, and f. The s sub-level can hold 2 electrons, the p sub-level can hold 6 electrons, the d sub-level can hold 10 electrons, and the f sub-level can hold 14 electrons. To determine which sub-energy level is represented by each peak in the spectrum, we need to match the number of electrons present in each peak to the number of electrons that can be accommodated by each sub-level.
For example, if we have a peak with 2 electrons, it would correspond to the s sub-level. If we have a peak with 6 electrons, it would correspond to the p sub-level. If we have a peak with 10 electrons, it would correspond to the d sub-level. And if we have a peak with 14 electrons, it would correspond to the f sub-level.