The Shell Model III

Model 1. Simulated Experimental Photoelectron Spectrum of Neon. 

a) Is the photoelectron spectrum for Ne shown in Model 1 consistent with our 

Why is it not important to place numbers along the vertical axis of photoelectron spectra  

Based on the spectrum in Model 1, estimate the number of electrons at each of the three energy levels in Ne. Explain your reasoning clearly. (Hint Recall that the total number of electrons should equal the number of electrons in a Ne atom.) 

Our refined shell model of the Ne atom has the 10 electrons distributed in three different energy levels 2 electrons in a Is level, 2 electrons in a 2s level, and 6 electrons in a 2p level. At this point we will not be concerned about the details of the differences between the 2s and 2p levels. The important point is that the 2s level is slightly lower in energy than the 2p, but not by a large amount. This suggests that the electrons in both levels of the = 2 shell are at nearly the same distance from the nucleus, and are clearly much farther from the nucleus than the electrons in the = 1 shell. Also, we have found that there appears to be a limit of 2 on the number of electrons that can be placed in an s sub shell. 

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