How does quantum theory explain exceptions to the ionization energy periodic trend?

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Ausra

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Hello,

I am currently studying for a Chemistry exam, and one of my review questions asks this:

"Ionization energy tends to increase from left to right on the periodic table. Two exceptions to that rule, however, are aluminum and sulfur. Explain them using quantum theory."

I'm not quite sure how to approach this particular question. Can anyone explain the answer in a clear, simple fashion? It would be so greatly appreciated!

Thanks!
 
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