## Expanded Octets and Formal Charge

Ashley Wang 4G
Posts: 103
Joined: Wed Sep 11, 2019 12:16 am

### Expanded Octets and Formal Charge

Hi,

In lecture it was mentioned that it it preferable for the non-central atoms to carry the nonzero formal charges when necessary. If the central atom has an expanded octet, is it then okay to have a nonzero formal charge on the central atom?

Thank you!

rabiasumar2E
Posts: 108
Joined: Thu Jul 11, 2019 12:15 am

### Re: Expanded Octets and Formal Charge

For the most part, the central atom will only have an expanded octet because we are trying to get the formal charge to zero. The point is just to draw the best lewis structure so if your formal charge for the central atom isn't zero and it has an expanded octet, I would try to move somethings around. Sorry if this is confusing! Hope it helps.

Caroline Zepecki
Posts: 101
Joined: Fri Aug 09, 2019 12:16 am

### Re: Expanded Octets and Formal Charge

Are there only particular atoms/molecules that allow for expanded octets? Also is there a way to explain why this is possible for some and not all?

rohun2H
Posts: 100
Joined: Wed Sep 18, 2019 12:19 am

### Re: Expanded Octets and Formal Charge

The expanded octet rule applies for atoms on the periodic table row 3 and beyond because electrons can utilize the d subshell.