Overall Charge Calculations

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Rachel Lipman
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Joined: Fri Sep 25, 2015 3:00 am

Overall Charge Calculations

Postby Rachel Lipman » Mon Oct 12, 2015 5:31 pm

How do you determine which numbers to add/subtract when calculating the overall charge in relation to the Lewis Structure?

Posts: 44
Joined: Fri Sep 25, 2015 3:00 am

Re: Overall Charge Calculations

Postby elizabethrojas1G » Mon Oct 12, 2015 5:47 pm

First, you're going to find how many valence electrons the element has (refer to the periodic table).
Then, on the Lewis structure of the compound, you're going to see bonds like this - and bonds that are black circles. the black circles are your "lone pair" electrons, your L value. the shared electrons are those with the "-" because they are being shared with another element. Lastly, plug in your values to the equation Formal Charge = V-(L + s/2)

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