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Resonance Structures
Tips, rules, and guidelines for drawing resonance structures.
7
Chemistry
Undergraduate 2
07/22/2009

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Cards

Term
Don't move
Definition
single bonds.
Term
Only move
Definition
pi electrons (double bonds, triple bonds, and lone-pair electrons).
Term
Cations next to a double bond, triple bond, or lone pair.
Definition
Push electrons from the double bond, triple bond, or lone pair toward the charged atom.
Term
If lone pairs are directly attached to a double or triple bond,
Definition
push the electrons from the lone pair toward the double bond or triple bond.
Term
If a double or triple bond contains and electronegative atom (such as O or N),
Definition
you can draw a resonance structure in which the pi electrons move onto the electronegative atom as a lone pair.
Term
If you have alternating double bonds around a ring,
Definition
push the double-bond electrons all the way around the ring to reform each of the double bonds between different atoms.
Term
Assigning importance to resonance structures
Definition
Those with fewer charges are more stable. The most stable structures have charges on best atom. Better to have complete octets (this is more important that having the charge on the best atom).
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