Lewis Structures with Br

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Aurbal Popal
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Joined: Fri Sep 28, 2018 12:27 am

Lewis Structures with Br

Postby Aurbal Popal » Sun Nov 04, 2018 1:11 pm

I know Br is an exception to the octet rule, but why is it in BrF3, there are two lone pairs on Br? I assumed there were none...
This is seen in problem 2b3 in the seventh edition where it asks for the Lewis structure of this molecule.

Alyssa Bryan 3F
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am
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Re: Lewis Structures with Br

Postby Alyssa Bryan 3F » Sun Nov 04, 2018 3:50 pm

If there were no lone pairs on Br and you fulfilled the octet rule for F then you would not have used all valence electrons. For BrF3 there are 28 valence electrons, meaning two lone pairs need to be placed on Br as just fulfilling the octet rule for the the fluorines uses 24 electrons.

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