Exceptions  [ENDORSED]

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Postby AlyssaPeckham1A » Sun Dec 10, 2017 12:25 am

When do you know that octet exceptions occur?

Silvino Jimenez 1A
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Re: Exceptions

Postby Silvino Jimenez 1A » Sun Dec 10, 2017 9:06 am

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!

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Re: Exceptions

Postby JonathanLam1G » Sun Dec 10, 2017 10:25 am

ALSO! remember to look at formal charges!

Jean Mok 3K
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Re: Exceptions

Postby Jean Mok 3K » Sun Dec 10, 2017 2:42 pm

Octet exceptions can occur when the element is from the third period and beyond because of the accessible d orbitals.

Elizabeth Parker 1K
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Re: Exceptions

Postby Elizabeth Parker 1K » Fri May 11, 2018 12:33 pm

This site was really helpful for me in making it clear when to recognize an exception. https://chem.libretexts.org/Core/Physic ... Octet_Rule

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Re: Exceptions

Postby MadelynNguyen1F » Sat May 12, 2018 12:16 pm

The expanded octet applies to atoms where n is greater than or equal to 3 because they have access to the d orbital.

Steven Luong 1E
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Re: Exceptions

Postby Steven Luong 1E » Sun May 13, 2018 2:31 am

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.

Harmonie Ahuna-1C
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Re: Exceptions  [ENDORSED]

Postby Harmonie Ahuna-1C » Sat May 19, 2018 2:58 pm

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.

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