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22/09/2021
Why? Because it’s a simple predictor of molecular shape.
The ozone molecule is ##O_3##, and each ##O## centre contributes 6 electrons to the valence shell.
A reasonable Lewis structure would be: ##O=O^(+)-O^(-)##. Because, around the central oxygen, there are 5 electrons (2 from the double bond, 1 from the single bond, and 2 from the lone pair), we assign this centre a positive charge, and of course we can assign each terminal oxygen a negative charge alternately by resonance.
Given the Lewis structure we predict by ##VSEPR## a bent molecule with ##/_O-O-O## ##<=## ##120″”^@##. What do we find experimentally? A bent molecule with intermediate ##O-O## bonds; ##/_O-O-O## ##=## ##116.8″”^@##.
Thus, by simply knowing how to draw a Lewis structure, counting the electrons, and using ##VSEPR##, we have predicted the structure of a gaseous molecule, which we can’t see, but we can smell. I think that is pretty clever given the (short!) time we spent on the problem.
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I want to thank your team (Jeff) for finding a new writer when you were unable to reach my existing writer to revise my paper. I appreciate your professionalism and efforts. Thanks
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