Octet Rule Exceptions

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Ashley Tran 2I
Posts: 108
Joined: Thu Jul 11, 2019 12:17 am

Octet Rule Exceptions

Postby Ashley Tran 2I » Fri Oct 25, 2019 8:50 am

Why are H, He, Li, and Be exceptions for the octet rule?

Reina Robles 2B
Posts: 71
Joined: Fri Aug 09, 2019 12:16 am

Re: Octet Rule Exceptions

Postby Reina Robles 2B » Fri Oct 25, 2019 8:59 am

They don’t need eight electrons to fill their shell. H and He only have the 1s shell, which only needs 2 electrons to fill it. Li and Be only have the 1s and 2s shell, and the 2s shell only needs two electrons to fill it.

Hope this helps!

Justin Quan 4I
Posts: 104
Joined: Sat Sep 14, 2019 12:17 am

Re: Octet Rule Exceptions

Postby Justin Quan 4I » Fri Oct 25, 2019 11:15 am

To add on, Li and Be are metals, and so they are like to lose electrons and become cations. After they lose their electrons they revert to a noble gas configuration. Also hydrogen doesn't need to fill its valance shell when forming bonds. Hydrogen just likes to give away its lone electron.

Sukanya Mohapatra 2G
Posts: 100
Joined: Sat Aug 17, 2019 12:18 am
Been upvoted: 1 time

Re: Octet Rule Exceptions

Postby Sukanya Mohapatra 2G » Fri Oct 25, 2019 11:34 am

H and He are exceptions to the octet rule since their full shell is two electrons. Li and Be are metals, making them more likely to lose electrons and turn into cations.

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