## Formal charge

sarahtang4B
Posts: 132
Joined: Fri Sep 28, 2018 12:27 am

### Formal charge

When we form double bonds, do we always need to check the formal charge of all the elements?

Daniel Lai
Posts: 65
Joined: Fri Sep 28, 2018 12:28 am

### Re: Formal charge

Yes, if you want to find the most stable form.

Lisa Werner 2F
Posts: 72
Joined: Fri Sep 28, 2018 12:17 am

### Re: Formal charge

Yes because it will determine where the double bond should go

almaochoa2D
Posts: 67
Joined: Fri Sep 28, 2018 12:23 am

### Re: Formal charge

You should always check the formula charge when you're drawing a lewis structure no matter way. This way you can make sure that the lewis structure you drew is the best one.

Soyoung Park 1H
Posts: 30
Joined: Sat Sep 29, 2018 12:15 am

### Re: Formal charge

Do you always check for formal charges even for single bonds?

404905747
Posts: 29
Joined: Fri Sep 28, 2018 12:17 am

### Re: Formal charge

yes, you always check formal charge no matter how many bonds.

kimberlyrose1G
Posts: 44
Joined: Fri Sep 28, 2018 12:27 am

### Re: Formal charge

Soyoung Park 1H wrote:Do you always check for formal charges even for single bonds?

Yes to make sure that your Lewis structure is the most stable form or if additional bonds need to be made (with respect to the octet rule) in order to increase stability

Veronica Soliman 4H
Posts: 51
Joined: Fri Sep 28, 2018 12:28 am

### Re: Formal charge

YES!
1. Count valence electrons (left to right on periodic table using s and p only - I think)
2. Create molecule's lewis structure
3. Find the FC of each molecule, Subtract the valence # of each molecule by the amount of dots and lines for each.
4. Try to rearrange to get it to be the most stable it can be when FC=0 on all, but if not possible, then bracket your lewis structure and add a + or - (+1,+2,+3, etc.. or -1,-2,-3, etc... is based on the summation of total formal charges...)