Understanding Formal Charge

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Kyilah Terry
Posts: 7
Joined: Fri Sep 25, 2015 3:00 am

Understanding Formal Charge

Postby Kyilah Terry » Sun Oct 25, 2015 12:20 am

I'm still a little confused about calculating the formal charge... Everyone keeps showing me a different method, but I think I'm just going to stick with what Lavelle showed in class. I know how to determine the valence electrons, but for the lone and shared pairs do I count each electron in the lone pair or count one pair as one. And do i count each bond as 1 or 2?

Destiny Dare 1D
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

Re: Understanding Formal Charge

Postby Destiny Dare 1D » Sun Oct 25, 2015 1:22 am

For both lone pairs and bonded electrons you count the electrons individually. For example, in a water molecule we know that oxygen has 2 lone pairs and 2 single bonds (1 single bond with each hydrogen). Using the formula given by Dr. Lavelle, , we find that the formal charge of oxygen in a water molecule is 0. We find this by plugging in 4 for L since there are 4 electrons in 2 lone pairs, and 4 for S since there are 4 electrons in 2 single bonds.

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