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Unformatted text preview: 2. Shared electrons are divided equally between the sharing atoms. (Valence e-) assigned = (# of lone pair e-) + (# of shared e-) 3. Atoms in molecules try to achieve formal charges as close to zero as possible. 4. Any negative formal charges are expected to reside on the most electronegative atoms. 2-SO 4 # of valence e- on each free O = 6 6e- + 4 x 6e- + 2e- = 32e-s o # of valence e- assigned on each O = 6+ (2) = 7 4 x 2e- + 8e-32e- - 8e- =24e- Formal charge on O = 6 - 7 = -1 # of valence e- on each free S = 6 # OF Valence e- assigned on each S = 0 +1/2 (8) = 4 Formal charge on S = 6 4 = +2...
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