Valence Electrons for Exceptions to Octets

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Janelle Magaling 3L
Posts: 11
Joined: Thu Oct 04, 2018 12:16 am

Valence Electrons for Exceptions to Octets

Postby Janelle Magaling 3L » Wed Oct 31, 2018 3:46 pm

In lecture today Prof Lavelle used BF3 as an example for an exception to the octet guideline. How did he reach that conclusion that there are only 6 valence electrons in BF3?

ThomasLai1D
Posts: 61
Joined: Fri Sep 28, 2018 12:17 am

Re: Valence Electrons for Exceptions to Octets

Postby ThomasLai1D » Wed Oct 31, 2018 3:56 pm

I think that's one of the exceptions to the octet rule. He was referring to that fact that Boron is stable with only 6 valence electrons, and therefore only shares three bonds with fluoride in BF3 and has no lone pairs (a lone pair would complete the octet rule, if it applied to Boron).

Ethan Nishikawa 4D
Posts: 36
Joined: Fri Sep 28, 2018 12:16 am

Re: Valence Electrons for Exceptions to Octets

Postby Ethan Nishikawa 4D » Wed Oct 31, 2018 5:06 pm

Boron is in group 13 along with Aluminum. They both need 5e- to complete their octet and are apart of a class of Acid-Base reactions. Boron in BF3 only completes its octet if another atom provides both e- to form a coordinate covalent bond.


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