CHEM 212 Lecture Notes - Electron Diffraction, Lone Pair, Bond Length

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We now turn from the use of quantum mechanics and its description of the atom to an elementary description of molecules. Although most of the discussion of bonding in this book uses the molecular orbital approach to chemical bonding, simpler methods that provide approximate pictures of the overall shapes and polarities of molecules are also very useful. This chapter provides an overview of lewis dot structures, valence shell electron pair repulsion (vsepr), and related topics. The molecular orbital descriptions of some of the same molecules are presented in chapter 5 and later chapters, but the ideas of this chapter provide a starting point for that more modern treatment. General chemistry texts include discussions of most of these topics; this chapter provides a re- view for those who have not used them recently. Ultimately, any description of bonding must be consistent with experimental data on bond lengths, bond angles, and bond strengths.

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