Ideal lewis structure with Formal Charge


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keyaluo4C
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Joined: Fri Sep 28, 2018 12:17 am

Ideal lewis structure with Formal Charge

Postby keyaluo4C » Sun Nov 04, 2018 8:48 pm

How do you know what the ideal Lewis Structure is when there are many different ways of calculating the formal charge? Is it mostly trial and error?

Emily Kennedy 4L
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Re: Ideal lewis structure with Formal Charge

Postby Emily Kennedy 4L » Sun Nov 04, 2018 8:51 pm

It all depends on what combination you can create with the lowest formal charge. If you have a lewis dot structure that should have a neutral charge and each atom has a negative 1 charge and a positive 1 charge that is not going to be as ideal as a lewis structure that has all neutral charges.

megansardina2G
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Re: Ideal lewis structure with Formal Charge

Postby megansardina2G » Sun Nov 04, 2018 8:55 pm

Hi! So most of the time, the ideal lewis structure forms when all atoms in the molecule have a formal charge of 0. If this is not possible, then the formal charge should be the lowest possible option (closest to net of 0). When there needs to be a charge, the negative charge should be placed on the more electronegative molecule. For example, take N2O with N as the central atom. The central N atom forms a triple bond with N and single bond with O as opposed to a double bond with both, since that places the negative formal charge on the N rather than the O, which is more electronegative. There is some form of trial and error, but you should be able to narrow it down a bit. Hope this helped!

Lia Inadomi 1I
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Joined: Fri Sep 28, 2018 12:15 am

Re: Ideal lewis structure with Formal Charge

Postby Lia Inadomi 1I » Mon Nov 05, 2018 3:16 pm

Does only the net formal charge matter? Or do you also have to account for each atom as well?

Courtney McHargue 1I
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Re: Ideal lewis structure with Formal Charge

Postby Courtney McHargue 1I » Wed Nov 07, 2018 1:19 pm

To find the most ideal lewis structure you want to create one where the base element, or element in the center of the structure, has a formal charge of 0. If the overall molecule is an ion with a charge, then try to have the outer elements which are connected to the main base be the ones that carry the positive or negative charge for the molecule as a whole.


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