PPT Slide

• The actual molecule is a resonance hybrid, something like an   average of the resonance forms.

• The presence of resonance structures indicates electron-pair   delocalization.

• In the resonance hybrid for O3, two of the electron pairs (one bonding and one nonbonding) are delocalized:

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The molecule is best shown with Lewis structures called resonance structures with a two-headed resonance arrow between them.

• Resonance structures have the same sequence of atoms but differ  in the locations of the electron pairs.

• Their density is “spread” over the entire molecule.

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