A sample containing atoms of C and F was analyzed using x-ray photoelectron spec

Question

A sample containing atoms of C and F was analyzed using x-ray photoelectron spectroscopy. The portion of the spectrum showing the is peaks for atoms of the two elements is shown above. Which of the following correctly identifies the 1s peak for the F atoms and provides an appropriate explanation? (A) Peak X, because F has a smaller first ionization energy than C has. (B) Peak X, because F has a greater nuclear charge than C has. (C) Peak Y. because F is more electronegative than C is. (D) Peak Y. because F has a smaller atomic radius than C has.

Explanation / Answer

B) Peak X, because F has a greater nuclear charge than C has.

Greater nuclear charge causes higher ionization energy and hence higher binding energy for 1s electron.

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