Formal Charge and its effect on Shape

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

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Angeline 3E
Posts: 50
Joined: Wed Sep 18, 2019 12:20 am

Formal Charge and its effect on Shape

Postby Angeline 3E » Mon Dec 02, 2019 11:21 pm

What are the Formal Charges rules to make the most ideal stable shape/structure? Thanks!
Last edited by Angeline 3E on Mon Dec 02, 2019 11:34 pm, edited 2 times in total.

Minh Ngo 4G
Posts: 137
Joined: Thu Jul 25, 2019 12:17 am

Re: Formal Charge and its effect on Shape

Postby Minh Ngo 4G » Mon Dec 02, 2019 11:30 pm

You are trying to make all the formal charges of each element equal to 0. Of course, if the compound as a whole has a negative or positive charge, at least one of them have to have a charged. When that happens, put the negative charge on the more electronegative one.
Last edited by Minh Ngo 4G on Mon Dec 02, 2019 11:36 pm, edited 1 time in total.

905416023
Posts: 54
Joined: Thu Jul 25, 2019 12:17 am

Re: Formal Charge and its effect on Shape

Postby 905416023 » Mon Dec 02, 2019 11:34 pm

Generally, your objective is to make the structure have a formal charge of 0. But sometimes the overall structure will have a charge of -1, 1, or really any number. Sometimes it will be clear where the charge should be placed, but other times it can by places on multiple different atoms. This is where resonance structures come in. In the case where the extra electron can be placed in many different places, you will have to draw out each of those structures and label them as resonance structures.

Osvaldo SanchezF -1H
Posts: 122
Joined: Wed Sep 18, 2019 12:21 am

Re: Formal Charge and its effect on Shape

Postby Osvaldo SanchezF -1H » Mon Dec 02, 2019 11:35 pm

You want the lewis structure to have the least amount of formal charges, or as close to 0. You don't want many atoms in the molecule to have a charge and want them to be as close to 0. So after considering this, you can deduce the shape that is created from the most favorable lewis structure.


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