Chemistry
Chemistry
Problem
A photoelectron spectrum collected for an unknown element shows four distinct peaks whose relative intensities (heights) from highest to lowest binding energy are 2 : 2 : 6 : 2. Which element is most consistent with this spectrum? a) b) c) d)Intuitive explanation
The key is recognizing that peak height in photoelectron spectroscopy tells you how many electrons are at that binding energy level. Adding up the relative intensities (2 + 2 + 6 + 2 = 12) gives you the total number of electrons, which identifies the element. Then match the pattern of peaks to the electron configuration—the highest binding energy peak corresponds to core electrons closest to the nucleus, while lower binding energies represent electrons in outer shells. This spectrum's 2:2:6:2 pattern should match a recognizable orbital filling sequence.
Intuitive explanation
The key is recognizing that peak height in photoelectron spectroscopy tells you how many electrons are at that binding energy level. Adding up the relative intensities (2 + 2 + 6 + 2 = 12) gives you the total number of electrons, which identifies the element. Then match the pattern of peaks to the electron configuration—the highest binding energy peak corresponds to core electrons closest to the nucleus, while lower binding energies represent electrons in outer shells. This spectrum's 2:2:6:2 pattern should match a recognizable orbital filling sequence.