## Formal Charge & Lewis Structures

$FC=V-(L+\frac{S}{2})$

Sofia Lombardo 2C
Posts: 90
Joined: Wed Sep 30, 2020 9:31 pm

### Formal Charge & Lewis Structures

We use formal charge to find the most stable lewis structure, but do we have to include all possible variations of the lewis structure (like we would with resonance)? Or can we just use the most stable structure?

Mia Meza
Posts: 50
Joined: Wed Sep 30, 2020 9:55 pm

### Re: Formal Charge & Lewis Structures

Posts: 96
Joined: Wed Sep 30, 2020 10:01 pm

### Re: Formal Charge & Lewis Structures

Sofia Lombardo 3F wrote:We use formal charge to find the most stable lewis structure, but do we have to include all possible variations of the lewis structure (like we would with resonance)? Or can we just use the most stable structure?

I think it depends on the question that is asked. Usually for formal charge questions, they ask for all the variations and then using formal charge, choose the correct one(the most stable one). But if it just asks for a lewis structure, then it is going to be the most stable one.

Sarah_Hoffman_2H
Posts: 90
Joined: Wed Sep 30, 2020 9:54 pm

### Re: Formal Charge & Lewis Structures

I think its the most stable structure, unless the question specifically asks to include other possible structures.

Juliet Cushing_2H
Posts: 103
Joined: Wed Sep 30, 2020 9:39 pm

### Re: Formal Charge & Lewis Structures

On Sapling they ask us to report the most stable structure via formal charge. Because of that I think we should plan to aim for drawing the most stable.

Pranav Daggubati 3C
Posts: 109
Joined: Wed Sep 30, 2020 9:35 pm

### Re: Formal Charge & Lewis Structures

Usually, the one with the correct formal charge allocation is the right answer, but some question may ask for an answer where you list all the allocations and then choose the most likely by basic rules.