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Unformatted text preview: electrons. The individual structures have no real existence. They are called resonance structures or contributing structures. Rules of Resonance Structures 1) Differ only in the position of electrons. Nuclei do not change positions. 2) Each contributing structure must be a valid Lewis structure. 3) Energy of real structure is lower than that of any of the contributing structures. 4) Major contributors have octets around all atoms and minimum charge separation. 5) Negative charges are best on the most electronegative atom and positive charges on the least electronegative atom. C O H H C O H H major e.g. H C CH O H H C CH O H e.g. best C O O O electrons move from areas of high electron density to areas of lower electron density....
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