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What are the octet exceptions?

Posted: Sun Nov 04, 2018 1:54 pm
by Alan Chang
Can some one help me with all the octet exceptions we need to know for the test? Thanks~

Re: What are the octet exceptions?

Posted: Sun Nov 04, 2018 3:19 pm
by Diviya Khullar 1G
H, He, Li, and Be are exceptions to the octet rule because they are smaller atoms. In additions elements in Group 13 don't necessarily need to have a full octet.

Re: What are the octet exceptions?

Posted: Sun Nov 04, 2018 3:21 pm
by 804991762_4A
Octet exceptions:
- H, Be, & B don't need a full octet, they can be incomplete bc it doesn't have 8 electrons: such as H can only hold 2 electrons.
- Expanded octet: Anything from the 3rd row and beyond can have an expanded octet meaning it could hold more than 8 electrons, while anything in the 1st and 2nd row can only have 8 electrons NO MORE.

Re: What are the octet exceptions?

Posted: Sun Nov 04, 2018 3:41 pm
by Mona Lee 4L
Essentially, the elements in rows 1&2 will never have more than 8 valence electrons. In rows 3+, n=3 so there are p shells, which allow atoms to expand their octet.

Re: What are the octet exceptions?

Posted: Sun Nov 04, 2018 5:47 pm
by taywebb
I understand why H is an exception to the octet rule, but can someone explain why Hi, Le, and Be are as well?

Re: What are the octet exceptions?

Posted: Sun Nov 04, 2018 6:47 pm
by Heidi Ibarra Castillo 1D
^I believe it is because they don't obtain 8 electrons, so they don't need to have a full octet

Re: What are the octet exceptions?

Posted: Mon Nov 05, 2018 12:00 am
by 404536963
Also, P, S, and cl are specific exceptions that Dr. Lavelle said we needed to know for the exam that take more than 8 valence electrons!

Re: What are the octet exceptions?

Posted: Wed Nov 14, 2018 12:29 am
by Rebecca Park
I’m pretty sure there was an exception to Boron for the octet rule.

Re: What are the octet exceptions?

Posted: Wed Nov 14, 2018 12:43 am
by Vanadium Wang 4H
taywebb wrote:I understand why H is an exception to the octet rule, but can someone explain why Hi, Le, and Be are as well?

Lithium and beryllium need to lose either one or two electrons, respectively, to attain an electron configuration of 1s^2 which is most stable.

Re: What are the octet exceptions?

Posted: Wed Nov 14, 2018 12:49 am
by Veronica Soliman 4H
Additionally, anything that is in the 8th valence shell area will not need to have covalent bonds or ionic bonds because noble gases are already full and happy.