Lewis Structure Octet Rule Exceptions

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Brandon_Williams_3E
Posts: 12
Joined: Wed Sep 21, 2016 2:59 pm

Lewis Structure Octet Rule Exceptions

Postby Brandon_Williams_3E » Tue Oct 25, 2016 12:47 pm

When drawing Lewis dot structures, when is it okay to leave certain atoms without an octet?

Mikaela Gareeb 3G
Posts: 31
Joined: Wed Sep 21, 2016 3:00 pm

Re: Lewis Structure Octet Rule Exceptions

Postby Mikaela Gareeb 3G » Tue Oct 25, 2016 4:06 pm

H, He, Li, and Be do not follow the octet rule. Also, B can form less than an octet, such as BF3, but it can also attain an extra electron to fulfill the octet rule, such as BF4^-

Kathy Vu 3L
Posts: 24
Joined: Fri Jul 15, 2016 3:00 am

Re: Lewis Structure Octet Rule Exceptions

Postby Kathy Vu 3L » Wed Oct 26, 2016 6:59 pm

Atoms with access to the d-block can also have an expanded octet. For example, sulfur has access to the 3d-block which is why it can take electrons from there to have an expanded octet.

Jocelyn Sandoval 3B
Posts: 26
Joined: Wed Sep 21, 2016 2:59 pm

Re: Lewis Structure Octet Rule Exceptions

Postby Jocelyn Sandoval 3B » Wed Oct 26, 2016 7:22 pm

It a good "rule of thumb" to know that anything after Carbon needs an octet. P, S, Cl and beyond can have more than 8 electrons because of the d block in the 3rd period.


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