Formal Charge - Formal Charge In some cases we can draw...

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Formal Charge In some cases we can draw several different Lewis structures which fulfill the octet rule for a compound. Which one is the most reasonable? One method is to tabulate the valence electrons around each atom in a Lewis structure to determine the formal charge . The formal charge is the charge that an atom in a molecule would have if we considered each atom to have the same electronegativity in a compound. To calculate formal charge, assign electrons to their respective atoms as follows: 1. All of the unshared electrons are assigned to the atom on which they are found 2. The bonding electrons are divided up equally between each atom involved in the bond 3. The number of valence electrons expected in the isolated atom is compared to the actual number of electrons assigned from the Lewis structure: The formal charge equals the number of valence electrons in the isolated atom, minus the number of electrons assigned in the Lewis structure Example: Carbon Dioxide (CO 2 )
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Formal Charge - Formal Charge In some cases we can draw...

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