2 lone pairs

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danielruiz1G
Posts: 62
Joined: Fri Apr 06, 2018 11:04 am

2 lone pairs

Postby danielruiz1G » Sun May 27, 2018 12:48 pm

On a structure that has 2 lone pairs on the center atom, how are we supposed to know when the strcutes go on the top and bottom or both stay on the top side?

Valeria Viera 1B
Posts: 60
Joined: Fri Apr 06, 2018 11:05 am

Re: 2 lone pairs

Postby Valeria Viera 1B » Sun May 27, 2018 1:57 pm

I think it’s important to have symmetry when drawing structures

Hope this helps

Samantha Draghi 1L
Posts: 24
Joined: Fri Apr 06, 2018 11:02 am

Re: 2 lone pairs

Postby Samantha Draghi 1L » Sun May 27, 2018 2:11 pm

Yes I think that they go on opposing sides so that they do not pull on just one side of the molecule

Emma Leshan 1B
Posts: 30
Joined: Fri Apr 06, 2018 11:03 am

Re: 2 lone pairs

Postby Emma Leshan 1B » Sun May 27, 2018 6:56 pm

Remember that a Lewis Structure is just a 2D model of a 3D shape. So for example, in water, with a tetrahedral shape, every region of electron density is next to every other, so there is no "top" or bottom. With Lewis structures, it doesn't matter where you draw the lone pairs because it doesn't necessarily mean anything in terms of the actual molecular shape.

Chiara Berruto 1K
Posts: 29
Joined: Fri Apr 06, 2018 11:01 am

Re: 2 lone pairs

Postby Chiara Berruto 1K » Mon Jun 04, 2018 7:19 pm

lone pairs should be placed as far apart from each other as possible since they have a very strong repulsion this would mean they should be placed on opposite sides (top and bottom)

Yixiao Hu 3C
Posts: 45
Joined: Fri Sep 28, 2018 12:19 am

Re: 2 lone pairs

Postby Yixiao Hu 3C » Mon Oct 29, 2018 3:09 pm

it does not matter whether you put it on the top or at the bottom. The only thing you only need to pay attention to is to put these two dots on different sides


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