Exceptions to Octet

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Rachel-Weisz3C
Posts: 66
Joined: Fri Sep 28, 2018 12:23 am

Exceptions to Octet

Postby Rachel-Weisz3C » Sun Oct 28, 2018 7:36 pm

Can someone explain the reason to why H, He, Li, and Be are the exceptions to the octet rule?

804994652
Posts: 68
Joined: Fri Sep 28, 2018 12:26 am

Re: Exceptions to Octet

Postby 804994652 » Sun Oct 28, 2018 7:46 pm

H and He are in the 1s shell which only need 2 e- to be a full shell. Li and Be are metals who tend to lose electrons and become the "noble gas" configuration of He (1s shell).

Ethan Yi 1K
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

Re: Exceptions to Octet

Postby Ethan Yi 1K » Sun Oct 28, 2018 8:00 pm

It's easier for Li and Be to become stable by losing 1 or 2 electrons respectively and becoming like the noble gas He, rather than gaining 6 or 7 electrons to become like Neon.


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