### Lewis Structures- formal charge

Posted:

**Tue Oct 30, 2018 10:29 pm**How can you find the formal charges on each atom in a Lewis structure?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=31&t=35251

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Posted: **Tue Oct 30, 2018 10:29 pm**

How can you find the formal charges on each atom in a Lewis structure?

Posted: **Tue Oct 30, 2018 10:36 pm**

You use the equation FC= V-(L+S/2), where FC is the formal charge, V is the number of valence electrons, L is the number of lone pairs, and S is the number of shared electrons.

Posted: **Thu Nov 01, 2018 4:46 pm**

This is the equation to find the formal charge.

Valance electrons - (lone pair electrons + number of bonds) = Formal charge.

Valance electrons - (lone pair electrons + number of bonds) = Formal charge.

Posted: **Thu Nov 01, 2018 5:27 pm**

Javier_Ochoa_DIS_3J wrote:This is the equation to find the formal charge.

Valance electrons - (lone pair electrons + number of bonds) = Formal charge.

I like using this equation more than the FC = V - (L + S/2) one because there is less room for error!

Posted: **Fri Nov 02, 2018 2:30 pm**

In order to calculate formal charge, use this equation:

FC= V - (L+ (S/2)), where V is the number of valence electrons, L is the number of electrons in lone pairs, and S is the number of shared electrons.

Hope this helps! :)

FC= V - (L+ (S/2)), where V is the number of valence electrons, L is the number of electrons in lone pairs, and S is the number of shared electrons.

Hope this helps! :)