Trigonal planar and bent shape

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Lorena Zhang 4E
Posts: 63
Joined: Fri Sep 28, 2018 12:16 am

Trigonal planar and bent shape

Postby Lorena Zhang 4E » Wed Nov 14, 2018 11:48 am

If the lewis structure of a molecule, for example ClO2+, has a lone pair, does it make the shape a trigonal planar or bent? I thought it would be bent, since the lone pair repulsion would make the bond angle slightly less than 120 degrees, but the answer says it should be trigonal planar.

Carolina Lechuga
Posts: 33
Joined: Fri Sep 28, 2018 12:17 am

Re: Trigonal planar and bent shape

Postby Carolina Lechuga » Wed Nov 14, 2018 11:59 am

we learned this in my discussion and according to my TA, trigonal-planar doesn't have a lone pair so the answer should be angular/bent. Im not sure why the book says that.

Heesu_Kim_1F
Posts: 60
Joined: Fri Sep 28, 2018 12:18 am

Re: Trigonal planar and bent shape

Postby Heesu_Kim_1F » Wed Nov 14, 2018 12:02 pm

The answer actually is that the shape is angular, which also means bent. However, it goes further to say that it is in a trigonal planar arrangement. I think what it's trying to explain is that its basic geometry is trigonal planar because the central atom consists of 3 regions of electron density. The molecular shape considering the lone pairs would be bent or angular. Hope this helps!


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