I know the correct answe is B, but i need explanation? I A sample containing ato

Question

I know the correct answe is B, but i need explanation?

I

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

Explanation / Answer

Flourine has 9 electrons. The electron configuration is 1s22s2 2p5 and the number of nonvalence electrons is 2. The atomic number for F is 9, therefore:

Zeff(F-) = 9 - 2 = 7+

Carbon has 6 electrons. The electron configuration is 1s22s2 2p2 and the number of nonvalence electrons is 2. The atomic number for C is 6, therefore:

Zeff(F-) = 6 - 2 = 4+

Since F has greater nuclear charge than C, it will have longer peak.

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