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E-Book Kimia. Chem bonding. Bond Angles and the Shapes of Molecules In the previous section a shared pair of electrons was presented as the fundamental unit of the covalent bond, and Lewis structures were drawn for several small molecules and ions containing various combinations of single, double, and triple bonds.
In this section, we use the valence-shell electron-pair repulsion (VSEPR) model to predict the geometry of these and other covalently bonded molecules and ions. The VSEPR model can be explained in the following way. We know that an atom has an outer shell of valence electrons.
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