Writing Resonance Structures Profesor Gary R. Gray 1. Resonance structures only involve a change in electron organization. H CCC H H H HC H H CCH Thes are difernt compounds and are not resonace structures. 2. Identical electronic arrangements are of equal importance. HCO O HC O O equal contributors, C-O bond order 1.5 C O OO C O O O C OO O equal contributors C- bond order 1.3 3. Structures containing the greater number of covalent bonds are more important. This is equivalent to saying that structures in which atoms have filled octets are more important. H C H OH H C H OH major contributor H C H N H H H C H N H H major contributor 3, continued HCO HCO major contributor FC F F FC F F major contributor 4. Structures involving a minimum of charge separation are more important. H C H O H C H O HC O OH HCO O H major contributor major contributor 5. Structures in which negative charges are borne by more electronegative elements and positive charges are borne by more electropositive elements are more important. HC O CH H HCC O H H C H H NN H C H NN major contributor major contributor Gary Gray Microsoft Word - Writing Resonance Structures.doc
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