### Resonance Structures and Formal charges

Posted:

**Thu May 10, 2018 11:22 am**What is the relationship between resonance structures and Formal charges? How does one relate to the other?

Created by Dr. Laurence Lavelle

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

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=32&t=31570

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Posted: **Thu May 10, 2018 11:22 am**

What is the relationship between resonance structures and Formal charges? How does one relate to the other?

Posted: **Thu May 10, 2018 1:17 pm**

Lewis structures incorporate an atom's formal charge, which is the charge on an atom in a molecule, assuming that electrons in a chemical bond are shared equally between atoms. When multiple Lewis structures can represent the same compound, the different Lewis formulas are called resonance structures.

Posted: **Thu May 10, 2018 2:31 pm**

Resonance structures are just different, equally stable, Lewis structures for an atom, so they all have the same charge!

Posted: **Sat May 12, 2018 9:28 pm**

The formal charge is used to discover the most stable Lewis structure. That structure will have the least number of formal charges not equal to zero. Resonance structure represents the various locations of the electron pairs. The electron can go back and forth between atoms.

Posted: **Sun May 13, 2018 8:19 am**

I thought this site explains the relationship between resonance structures and formal charges well. It also goes really in-depth with well-explained examples.

https://chem.libretexts.org/Core/Physic ... /Resonance

https://chem.libretexts.org/Core/Physic ... /Resonance

Posted: **Sun May 13, 2018 4:25 pm**

So if there are multiple different ways to draw a molecule, where each as a different formal charge (like the examples in class), are these not resonance?

Posted: **Sun May 13, 2018 5:07 pm**

So for our upcoming tests, the only acceptable lewis structures are those with a formal charge of 0?

Posted: **Sun May 13, 2018 10:00 pm**

Not all most stable Lewis structures have a formal charge of 0. Most stable Lewis structures minimize the number of formal charges.