Octet Exception

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Maverick Tan 1F
Posts: 15
Joined: Fri Oct 07, 2016 3:02 am

Octet Exception

Postby Maverick Tan 1F » Fri Oct 14, 2016 8:15 pm

Can someone please explain how the elements Li, and Be, are an exception to the octet rule?

Jennifer_Wong_1G
Posts: 10
Joined: Fri Jul 15, 2016 3:00 am

Re: Octet Exception

Postby Jennifer_Wong_1G » Fri Oct 14, 2016 9:09 pm

For period 2 elements to obey the octet rule, they need to complete their valence shell with eight electrons. Li and Be follow the octet rule when they ionize, but they are exceptions to the octet rule when they form covalent compounds. This is because they don't have enough valence electrons to form four electron-pair bonds. Lithium has one valence electron and so is most stable when it gives up an electron. Beryllium has two valence electrons but can only form electron pair bonds in two locations.

Hope this helps!


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