Photoelectron Spectroscopy (PES) Worksheet
A Grade 11 Science worksheet covering the principles and applications of Photoelectron Spectroscopy (PES), including interpreting PES spectra and understanding electron configuration.
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Photoelectron Spectroscopy (PES) Worksheet
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Read each question carefully and provide your answers in the space provided. For multiple-choice questions, circle the letter corresponding to the correct answer.
1. Which of the following best describes the principle of Photoelectron Spectroscopy (PES)?
Measuring the energy released when electrons jump to higher energy levels.
Analyzing the diffraction patterns of electrons passing through a crystal lattice.
Determining the kinetic energy of electrons ejected from an atom by incident photons.
Observing the absorption of electromagnetic radiation by atomic nuclei.
2. A PES spectrum shows peaks at different binding energies. What does the height of a peak typically represent?
The number of neutrons in the nucleus.
The number of electrons in that specific energy level (subshell).
The atomic mass of the element.
The ionization energy of the entire atom.
3. In Photoelectron Spectroscopy, incoming photons cause the of electrons from an atom.
4. The binding energy of an electron is inversely proportional to its after ejection.
5. A PES spectrum can provide direct evidence for the existence of within an atom.
6. Explain how the kinetic energy of an ejected electron is related to its binding energy and the energy of the incident photon.
7. Consider the PES spectrum of an unknown element. If the spectrum shows peaks corresponding to binding energies of 104 MJ/mol, 6.84 MJ/mol, and 0.50 MJ/mol, what can you infer about the electron configuration of this element? (Assume the largest peak corresponds to the 1s electrons).
8. Electrons in the same principal energy level (shell) always have identical binding energies.
True
False
9. A larger binding energy indicates that an electron is held more tightly by the nucleus.
True
False
Match the term on the left with its description on the right.
10. Core electrons
a. The energy required to remove an electron from an atom.
11. Valence electrons
b. Electrons in the outermost shell, involved in chemical bonding.
12. Binding energy
c. Electrons in inner shells, not typically involved in bonding.