Exceptions [ENDORSED]

[AlyssaPeckham1A]

When do you know that octet exceptions occur?

[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!

[JonathanLam1G]

ALSO! remember to look at formal charges!

[Jean Mok 3K]

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

[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

[MadelynNguyen1F]

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]

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]

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.