2.B 5 part b

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Melody Haratian 2J
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2.B 5 part b

Postby Melody Haratian 2J » Sun Nov 08, 2020 7:04 am

Hi everyone! For question 2B.5 part b from the textbook, which is “ Draw the Lewis structure of (b) hypobromite ion BrO-“ I was wondering why the structure doesn’t have a double bond instead of the single bond it’s shown to have in the answer key.

Victor Qiu 1C
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Re: 2.B 5 part b

Postby Victor Qiu 1C » Sun Nov 08, 2020 7:24 am

Br has 7 valence electrons while O has 6, and because it is BrO-, there should be 7+6+1=14 electrons in total. If there is a double bond, there should be 10 electrons that do not form bonds surrounding Br and O. When there is a double bond, Br allows 2 pairs of electrons around it, and O also allows 2 pairs of electrons around it, so they would allow 8 electrons surrounding them in total. However, if this is the case, there will be 10-8=2 electrons that have no place to go. Therefore, there can not be a double bond because if there is a double bond, octet rule can not be satisfied.


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