4.23, confusing LS

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Jacy Black 1C
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Joined: Fri Apr 06, 2018 11:01 am

4.23, confusing LS

Postby Jacy Black 1C » Fri Jun 08, 2018 12:13 pm

The question is asking for the lewis structure and to predict the shape of various molecules. Part a) asks to do so for OSbCl3.

When I made the LS for OSbCl3, I found that the lowest possible FC was found when there was a double bond between O and Sb, as Sb expands its octet (which it can do, because it is in/below period #3.) The answer book says that the LS is actually Sb with a single bond to 0, and single bonds to 3 different Cls. I am very confused on why this is the LS, as this structure has Sb with a FC of +1 and O has a FC of -1. Why wouldn't we want the structure that provides Sb with a 0 charge, as well as a 0 charge for O?

Please and thank you in advance for your responses.

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Joined: Fri Apr 06, 2018 11:05 am

Re: 4.23, confusing LS

Postby sharonvivianv » Fri Jun 08, 2018 4:32 pm

The book mentions that other structures are possible and more stable. They could've just wanted the easiest to draw on there or soemthing. There is no real reason why they did that.

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