What are the octet exceptions?

Moderators: Chem_Mod, Chem_Admin

Alan Chang
Posts: 33
Joined: Fri Sep 28, 2018 12:29 am

What are the octet exceptions?

Postby Alan Chang » Sun Nov 04, 2018 1:54 pm

Can some one help me with all the octet exceptions we need to know for the test? Thanks~

Diviya Khullar 1G
Posts: 59
Joined: Fri Sep 28, 2018 12:19 am

Re: What are the octet exceptions?

Postby Diviya Khullar 1G » Sun Nov 04, 2018 3:19 pm

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.

804991762_4A
Posts: 47
Joined: Fri Apr 06, 2018 11:04 am

Re: What are the octet exceptions?

Postby 804991762_4A » Sun Nov 04, 2018 3:21 pm

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.

Mona Lee 4L
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

Re: What are the octet exceptions?

Postby Mona Lee 4L » Sun Nov 04, 2018 3:41 pm

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.

taywebb
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Re: What are the octet exceptions?

Postby taywebb » Sun Nov 04, 2018 5:47 pm

I understand why H is an exception to the octet rule, but can someone explain why Hi, Le, and Be are as well?

Heidi Ibarra Castillo 1D
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

Re: What are the octet exceptions?

Postby Heidi Ibarra Castillo 1D » Sun Nov 04, 2018 6:47 pm

^I believe it is because they don't obtain 8 electrons, so they don't need to have a full octet

404536963
Posts: 29
Joined: Fri Feb 02, 2018 3:02 am

Re: What are the octet exceptions?

Postby 404536963 » Mon Nov 05, 2018 12:00 am

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!

Rebecca Park
Posts: 30
Joined: Fri Sep 28, 2018 12:17 am

Re: What are the octet exceptions?

Postby Rebecca Park » Wed Nov 14, 2018 12:29 am

I’m pretty sure there was an exception to Boron for the octet rule.

Vanadium Wang 4H
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

Re: What are the octet exceptions?

Postby Vanadium Wang 4H » Wed Nov 14, 2018 12:43 am

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.

Veronica Soliman 4H
Posts: 51
Joined: Fri Sep 28, 2018 12:28 am

Re: What are the octet exceptions?

Postby Veronica Soliman 4H » Wed Nov 14, 2018 12:49 am

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.


Return to “Octet Exceptions”

Who is online

Users browsing this forum: No registered users and 1 guest