Ch_322a_1.019

Ch_322a_1.019 - Valence Shell Electron Pair Repulsion...

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Valence Shell Electron Pair Repulsion Theory VSEPR theory provides a simple way to predict molecular geometries around a central atom. These predictions are consistent with hybrid molecular orbital theory. Key Features of VSEPR Theory (2) All pairs of valence electrons around the central atom are counted: bonding and nonbonding . (3) Because of electron-electron repulsion, pairs of electrons tend to stay as far apart as possible. Repulsion due to nonbonding pairs of electrons is greater than repulsion due to bonding pairs. (4) The preferred geometry has all pairs of valence electrons as far apart as possible to minimize repulsion among electron pairs. Molecules or ions may be analyzed where a central atom is covalently bonded to two or more atoms or groups. (1)
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Methane C H H H H There are four pairs of bonding electrons in the valence level around the central carbon. Maximum separation of the four pairs is achieved with a tetrahedral geometry where each electron pair points to the corner of a tetrahedron. : : : : 109.5
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Ch_322a_1.019 - Valence Shell Electron Pair Repulsion...

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