Question

which element is represented by the pes absorption spectra shown?

Explanation:

Step1: Analyze PES spectrum electron counts

The PES spectrum has three peaks. The first (highest binding energy) has 2 electrons, the second has 2 electrons, and the third has 4 electrons. Total electrons: \(2 + 2 + 4 = 8\).

Step2: Relate electron count to element

An element's atomic number equals its electron count (in neutral state). Atomic number 8 is oxygen.

Answer:

Oxygen (O)