Formal Charge and Lewis Structures


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sallina_yehdego 2E
Posts: 75
Joined: Sun Apr 29, 2018 3:00 am

Formal Charge and Lewis Structures

Postby sallina_yehdego 2E » Sun Nov 04, 2018 9:52 pm

When drawing out the Lewis Structures, are we supposed to add the charges on the atoms even when it's not asked in the problem?

405112316
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

Re: Formal Charge and Lewis Structures

Postby 405112316 » Sun Nov 04, 2018 9:55 pm

I don't think so. I'm guessing the question will explicitly ask for the formal charge if needed.

SophiaKohlhoff4B
Posts: 30
Joined: Fri Sep 28, 2018 12:16 am

Re: Formal Charge and Lewis Structures

Postby SophiaKohlhoff4B » Sun Nov 04, 2018 10:13 pm

The formal charges could be useful in determining the most favorable arrangement of atoms in a molecule, and therefore the most likely Lewis structure. The Lewis structure with formal charges closest to zero is, typically, most likely because it usually represents the lowest-energy arrangement of atoms and electrons.

Andrew Lam 3B
Posts: 30
Joined: Fri Sep 28, 2018 12:24 am

Re: Formal Charge and Lewis Structures

Postby Andrew Lam 3B » Sun Nov 04, 2018 10:17 pm

Generally the most stable configuration is one where the formal charge is minimized on all the atoms involved. Usually you don't have to draw them but it can be helpful if a test question were to ask of the two lewis structures which one is favored.

taryn_baldus2E
Posts: 62
Joined: Fri Sep 28, 2018 12:24 am

Re: Formal Charge and Lewis Structures

Postby taryn_baldus2E » Sun Nov 04, 2018 10:21 pm

No, but it is recommended that you still identify the formal charge of each atom to ensure that you have drawn the best possible structure.

Andrew Bennecke
Posts: 62
Joined: Fri Sep 28, 2018 12:15 am

Re: Formal Charge and Lewis Structures

Postby Andrew Bennecke » Sun Nov 04, 2018 10:32 pm

We only need to add the charges if it is asking for the most likely resonance structure or strongest contributor to the resonance hybrid.


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