2B.3

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SajaZidan_1K
Posts: 56
Joined: Wed Sep 18, 2019 12:15 am

2B.3

Postby SajaZidan_1K » Fri Oct 25, 2019 11:01 pm

Draw the Lewis structure of (d) BrF3

Why does Br have two extra lone pairs at the top? Is it one of the exceptions to the octet rule?

Kyla Grunden 1L
Posts: 46
Joined: Sat Sep 07, 2019 12:16 am

Re: 2B.3

Postby Kyla Grunden 1L » Sat Oct 26, 2019 9:13 am

Bromine is an exception to the octet rule because it's in the fourth period (these exceptions occur after the third period).

There are a total of 28 electrons in the molecule (7 in Bromine and 7*3 in Fluoride). There is a single bond between the bromine and each of the fluorides, and the fluorides have their valence electrons filled. At this point, there are 24 electrons in our lewis structure, meaning the only place we can add lone pairs is the bromine because the fluorides are already filled.


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