Daily Chemistry Class Notes

Daily Chemistry Class Notes - 2. Shared electrons are...

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Chemistry 2 Dec 09 (Wed.) Ch. 8.12 Formal Charge the formal charge of a n atom in a molecule is the difference between the number of valence e-  on the free atom and the number of valence e- assigned to the atom in the molecule. 1. The number of valence electrons on the free neutral atom (which has zero meet charge  because the number of electrons equals the number of protons.)   2. The number of valence electrons “belonging” to the atom in a molecule. -Formal change = (# of valence e- on free atom) -(# of valence e- assigned to the atom in the molecule). To compute the formal charge of an atom in a molecule, we assign the valence electrons in the  molecule to the various atoms, making the following assumptions: 1. Lone pair electrons belong entirely to the atom in question.
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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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Daily Chemistry Class Notes - 2. Shared electrons are...

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