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Postby JohnWalkiewicz2J » Fri Nov 01, 2019 3:57 pm

Are there any significant exceptions in atomic trends that would be important to memorize for the midterm?

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Re: Exceptions

Postby xenamclean_1G » Fri Nov 01, 2019 4:05 pm

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.

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Re: Exceptions

Postby alicechien_4F » Fri Nov 01, 2019 11:21 pm

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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Re: Exceptions

Postby TYun_1C » Fri Nov 01, 2019 11:56 pm

And a half filled shell is more stable than one that is half filled with an extra electron (regarding ionization energy etc.).

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