Photoelectron Spectroscopy
A PES spectrum of a certain element shows five peaks. Listed from highest to lowest binding energy, the relative heights of the peaks are 2, 2, 6, 2, and 5. Which element produces this spectrum?
In the PES spectrum of magnesium, which subshell corresponds to the peak at the lowest binding energy?
The 1s binding energy of neon is approximately 84.0 MJ/mol, while the 1s binding energy of boron is approximately 19.3 MJ/mol. Which statement best explains this difference?
A researcher analyzes two gaseous species, each with exactly 10 electrons. Species X shows all peaks shifted to higher binding energies compared to Species Y. Which pair could represent Species X and Species Y?
A student examines a PES spectrum and observes that one peak is three times taller than another peak. The student concludes that the taller peak represents electrons that are three times more tightly bound to the nucleus. What is the error in this reasoning?
Consider the PES spectra of the elements Li, Be, and B. All three spectra show a peak corresponding to the 1s subshell. Which correctly ranks the 1s binding energies of these elements from lowest to highest?
An element has a PES spectrum with peaks at relative heights of 2, 2, 6, 2, and 6 listed from highest to lowest binding energy. A student writes the electron configuration as 1s² 2s² 2p⁶ 3s² 3p⁶. The student then claims this must be argon in its ground state. Under what circumstance would this claim be incorrect?
A PES experiment is performed on gaseous sodium atoms. The spectrum shows four peaks. Listed from highest to lowest binding energy, the relative heights are 2, 2, 6, and 1. Calculate the total number of electrons and determine which peak would show the greatest shift in binding energy if the nuclear charge were hypothetically increased by one proton (without adding any electrons).
An unknown element has a PES spectrum with exactly two peaks. The peak at higher binding energy has a relative height of 2, and the peak at lower binding energy also has a relative height of 2. A student claims the element must be beryllium. Another student argues it could be helium. Which student is correct, and why?
The PES spectrum of element Q shows six peaks with relative heights (from highest to lowest binding energy) of 2, 2, 6, 2, 6, and 1. A chemist removes one electron from the outermost subshell to form Q⁺. Which statement correctly describes how the PES spectrum of Q⁺ differs from that of neutral Q?
Two elements, X and Y, are in the same period of the periodic table. Element X has a PES spectrum with five peaks, while element Y has a PES spectrum with four peaks. Both elements are in Period 3. Which of the following pairs could represent X and Y?
In the PES spectrum of a neutral phosphorus atom, how many peaks are observed and what are their relative heights from highest to lowest binding energy?
A student is studying the PES spectrum of carbon and notices that the 2s peak appears at a higher binding energy than the 2p peak, even though both subshells are in the same principal energy level. Which explanation is most accurate?
A forensic chemist analyzes an unknown gaseous ion and obtains a PES spectrum with three peaks. The relative heights from highest to lowest binding energy are 2, 2, and 6. The chemist determines that all peaks are shifted to higher binding energies compared to a neutral neon atom. What is the identity of this ion?
A volcanic gas sample is analyzed by PES, and the spectrum reveals three peaks with relative heights of 2, 2, and 4 from highest to lowest binding energy. A geochemist unfamiliar with PES suggests the element might be carbon because carbon has 6 electrons. Evaluate this claim and identify the correct element.