Question

A photoelectron spectrum of a compound containing nitrogen (N), aluminium (Al), and fluorine (F) shows three strong peaks at the following binding energies:
Peak X: ~686 eV
Peak Y: ~399 eV
Peak Z: ~73 eV

Find the best option from the choices given below that best explains the relative positioning of these peaks in terms of binding energy.

21 Jan 2026
Answer :
Word Count : 197
In a photoelectron spectrum, the binding energy of a peak depends primarily on the effective nuclear charge experienced by the electron and the electronegativity of the atom from which it is ejected. More electronegative atoms hold their core electrons more tightly and therefore give rise to peaks at higher binding energies. Fluorine is the most electronegative of the three elements present, so its core electrons experience the greatest attraction to the nucleus. As
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