CHEM 111 Chapter Notes - Chapter 7: Valence Bond Theory, Molecular Geometry, Vsepr Theory

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Valence-shell electron-pair repulsion theory and molecular shape. The valence shell electron-pair repulsion (vsepr) theory allows chemists to easily predict the shapes of molecules and ions made up of nonmetals. Positions around a central atom are occupied by structural electron pairs, nonbonding or bonding electrons that repel one another and are arranged so as to avoid one another as best as possible. Structural electron pairs can be nonbonding electrons, where each pair of electrons (or single electrons, in free radicals) is counted as one structural electron pair on a central atom. Structural electron pairs can be bonding electrons, where each bond (single or multiple) is counted as one structural electron pair on a central atom. The electron-pair geometry is the arrangement of the structural electron. The shape (also called molecular geometry) is the arrangement of atoms pairs around the central atom. around the central atom. The electron-pair geometry is defined by the arrangement of structural electron pairs around the central atom.

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