Steps for Lewis Structures

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Steps for Lewis Structures

Postby 005199750 » Sun Nov 04, 2018 10:40 pm

Hi everyone! This is more of a conceptual/study method type of question. I was wondering if y'all could share how you approach Lewis Structure problems, specifically in terms of doing it in steps (because that would help me get through problems more effectively). For instance, the first step would be to count all the valence electrons in the compound. Thanks!
Last edited by 005199750 on Mon Nov 05, 2018 4:45 pm, edited 1 time in total.

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Re: Steps for Lewis Structures

Postby 804991762_4A » Sun Nov 04, 2018 10:52 pm

1st: count the number of valence electrons
2nd: Make an element the central atom. The central atom should be that atom with the lowest ionization energy.
3rd: Place the electrons symmetrically around the elements
4th: Usually I check whether or not there may be octet exceptions and check if the element can have an expanded octet if called for.
5th: Check formal charge and make sure it is at its lowest energy state.

Roberto Gonzalez 1L
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Joined: Fri Sep 28, 2018 12:17 am

Re: Steps for Lewis Structures

Postby Roberto Gonzalez 1L » Sun Nov 04, 2018 11:56 pm

Is it necessary to write formal charges at all times? Or only when explicitly told to do so? Also, for resonance structures is a hybrid resonance structure always expected if there are in fact delocalized double or triple bonds?

Ester Garcia 1F
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Joined: Fri Sep 28, 2018 12:17 am

Re: Steps for Lewis Structures

Postby Ester Garcia 1F » Mon Nov 05, 2018 12:01 am

To answer ^ this question, formal charge is used to determine the best Lewis structure of a molecule. The structure with less formal charges is best because it is considered more stable.

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