## Formal Charge For Element In The Middle [ENDORSED]

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

Michelle Lee 2E
Posts: 64
Joined: Thu Jul 27, 2017 3:01 am

### Formal Charge For Element In The Middle

We learned in Oct. 27th's lecture that when using formal charge, the best structure would be when the middle element has a 0 formal charge. Why is this? Also what if there is no 0 formal charge for the element in the middle of the lewis structure, or is it always possible to have an element in the middle of the lewis structure with a formal charge of 0?

Dr. Lavelle also mentioned something about electron affinity when talking about this. I couldn't hear what he said so how does electron affinity connect to this?

Kendall Schemmer 1I
Posts: 20
Joined: Fri Sep 29, 2017 7:03 am

### Re: Formal Charge For Element In The Middle

To clarify, the best structure is when the entire molecule's overall charge is 0. It does not necessarily matter if it is the central atom or not.

Gobinder Pandher 3J
Posts: 21
Joined: Fri Sep 29, 2017 7:07 am

### Re: Formal Charge For Element In The Middle

The central atom does not necessarily need to have a formal charge of 0. However, having the central atom have a formal charge of 0 will typically lead to an balanced/favored Lewis Structure.

Gurshaan Nagra 2F
Posts: 49
Joined: Thu Jul 27, 2017 3:01 am

### Re: Formal Charge For Element In The Middle  [ENDORSED]

Dr. Lavelle also mentioned that the formal charge and the molecule's overall charge should be equal.