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Exceptions

Posted: Sun Dec 10, 2017 12:25 am
by AlyssaPeckham1A
When do you know that octet exceptions occur?

Re: Exceptions

Posted: Sun Dec 10, 2017 9:06 am
by Silvino Jimenez 1A
Atoms that include the 3d orbital can have expanded octets.

The Xe in XeF4 breaks the octet rule and can have expanded octet since Xe includes 3d orbital



Hope this helps!

Re: Exceptions

Posted: Sun Dec 10, 2017 10:25 am
by JonathanLam1G
ALSO! remember to look at formal charges!

Re: Exceptions

Posted: Sun Dec 10, 2017 2:42 pm
by Jean Mok 3K
Octet exceptions can occur when the element is from the third period and beyond because of the accessible d orbitals.

Re: Exceptions

Posted: Fri May 11, 2018 12:33 pm
by Elizabeth Parker 1K
This site was really helpful for me in making it clear when to recognize an exception. https://chem.libretexts.org/Core/Physic ... Octet_Rule

Re: Exceptions

Posted: Sat May 12, 2018 12:16 pm
by MadelynNguyen1F
The expanded octet applies to atoms where n is greater than or equal to 3 because they have access to the d orbital.

Re: Exceptions

Posted: Sun May 13, 2018 2:31 am
by Steven Luong 1E
An exception may or may not exist once you go past the 2nd energy level into the 3rd and beyond. Since there exists the d orbital in the 3rd energy level, the atom can get more electrons as needed.

Re: Exceptions  [ENDORSED]

Posted: Sat May 19, 2018 2:58 pm
by Harmonie Ahuna-1C
JonathanLam1G wrote:ALSO! remember to look at formal charges!

I think this is one of the easiest ways to determine if extra electrons or bonds are needed. If you know the atom includes the d orbital and you follow the octet rule and have electrons left over which lead to a charge, then you can try to determine if you can make it more stable and get FC to 0 by adding electrons.