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Lewis Structure of BrF3

Posted: Tue Oct 30, 2018 11:39 pm
by JulieAljamal1E
I'm confused as to why the lewis structure of BrF3 permits 10 electrons surrounding Br (3 single bonds with each F for a total of 6 electrons) and then two pairs of lone pairs (4 electrons). I understand Bromine needs 7 valence electrons, but why are we allowed to add those extra lone pairs and break the octet rule?

Re: Lewis Structure of BrF3

Posted: Wed Oct 31, 2018 12:40 am
by Fanny Lee 2K
Since Br fills up the 4p orbital, it can have more than an octet.

Re: Lewis Structure of BrF3

Posted: Wed Oct 31, 2018 1:12 am
by Sameen Mahmood 3D
Actually bromine needs an octet BUT it can occupy more than an octet because it's an element in period 3 or later (it can occupy more electrons because of the presence of the d subshell). It's just a rule you have to memorize.

Re: Lewis Structure of BrF3  [ENDORSED]

Posted: Wed Oct 31, 2018 3:27 pm
by Olivia Young 1A
The lewis structure of BrF3 permits Br to have 10 valences electrons, which is above the octet rule of 8 valence electrons, because it is in period 3 or higher of the periodic table. Because Br is in period 4, it has an n value of n = 4. Therefore, l can be equal to 0, 1, 2, or 3. The l value of 2 creates a d-orbital, and the l value of 3 creates the f-orbital. The d-orbital can hold 10 electrons, while the f-orbital can hold 14. As long as the element is in period 3 or higher, it is able to have over 8 valence electrons.