Lowest Energy Lewis Structures

(Polar molecules, Non-polar molecules, etc.)

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Jasmine Reddy DIS 1E
Posts: 34
Joined: Fri Sep 28, 2018 12:17 am

Lowest Energy Lewis Structures

Postby Jasmine Reddy DIS 1E » Tue Nov 13, 2018 7:11 pm

When using the Lewis Structure of a molecule to determine the molecular shape, should we use the lowest energy Lewis Structure by checking formal charges, and using the octet exceptions (expanded octet, etc.) when necessary?

Francis_Nguyen3D
Posts: 35
Joined: Fri Sep 28, 2018 12:24 am

Re: Lowest Energy Lewis Structures

Postby Francis_Nguyen3D » Tue Nov 13, 2018 7:22 pm

I believe that it would be best to use the Lewis Structure with the lowest energy and with octet exceptions because it would give a more accurate representation of the shape of the molecule. If we were to ignore formal charges and octet exceptions, we might miss a crucial double bond that could help us determine an accurate molecular shape.

Andre_Galenchik_2L
Posts: 69
Joined: Fri Sep 28, 2018 12:23 am

Re: Lowest Energy Lewis Structures

Postby Andre_Galenchik_2L » Tue Nov 13, 2018 10:03 pm

Just always make sure to first have all the atoms have an octet. After all the atoms have an octet, check the formal charges of each atom and adjust accordingly (usually by adding double bonds).

Katie Frei 1L
Posts: 64
Joined: Fri Sep 28, 2018 12:27 am

Re: Lowest Energy Lewis Structures

Postby Katie Frei 1L » Tue Nov 13, 2018 10:13 pm

Yes, I always use the Lewis structure with the lowest energy by looking at the formal charges because this corresponds to the most likely molecular shape of the compound. And also make sure you satisfy the octet rule and its exceptions!


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