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I think some exceptions worth remembering are : Boron has a lower ionization energy than Beryllium and Oxygen has a lower ionization energy than Nitrogen (which contradicts the general trend). Nitrogen's electron affinity is lower than carbon's and that Neon's is lower than fluorine's and lithiums.
The noble gases do not follow the electron affinity trend because they have a full set of valence electrons. They are also often excluded from electronegativity trends because they do not bond since their shell is full. Hope this helps!
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