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Unformatted text preview: Resonance Example 74: Write Lewis dot and dash formulas for sulfur trioxide, SO 3 . You do it! Formal Charge Calculation of a formal charge on a molecule is a mechanism for determining correct Lewis structures The formal charge is the hypothetical charge on an atom in a molecule or polyatomic ion. The best Lewis structures will have formal charges on the atoms that are zero or nearly zero. Formal Charge Rules for Assigning Formal Charge 1. Formal Charge = grp number (number of bonds + number of unshared e) 2. An atom that has the same number of bonds as its periodic group number has a formal charge of 0....
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 Fall '07
 Atwood

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