Unit 11B - Advanced Lewis Dot Structures and Resonance - Molecular Bonding - AP Chemistry

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5 Terms

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resonance

double/triple bonds can be shared simultaneously in multiple places at once

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electron pushing

where a pair of unbound e- are used to create a new bond, forcing e- in an adjacent bond to become unbound

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formal charge

represents the difference between the number of valence electrons an atom possesses in its free state (before bonding) and the number assigned to it in a given Lewis structure (after bonding)

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assigning formal charge

= number of original valence - number of final valence

= number of original valence - (non-bonding + ½ bonding e-)

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most stable resonance structure

has negative/positive charges placed on the proper elements based upon their relative EN values, minimizes nonzero formal charges, avoids nonzero formal charges on adjacent atoms