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Postby ChristianM3F » Sat Nov 02, 2019 8:38 pm

So, the solution for the structure of BrF3 had bromine not form an octet...
So is it a rule that, if they give you a chemical formula and tell you to make a Lewis structure, it's ok for the central atom to not have an octet? I think I just need to know the exceptions to the octet rule in general.

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Re: 2a9d???

Postby HanaAwad_4B » Sat Nov 02, 2019 9:01 pm

Exceptions to the octet include: H, He, Li, Be, B, and anything after the first two rows of the periodic table. The octet rule does not really apply to the majority of the periodic table. Because Br is after the second row of the periodic table, it usually has more than 8 electrons when it is the central atom. In this specific case, Bromine will have three bonds and two lone pairs of electrons.

Ada Chung 1C
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Re: 2a9d???

Postby Ada Chung 1C » Sat Nov 02, 2019 9:03 pm

Aside from the exceptions listed above some examples of elements that can have an expanded octet are Phosphorus, Sulfur, and Chlorine.

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