CHEM 112 Chapter 10 : VSEPR
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9 Nov 2017
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Electron group geometry - distribution of electron pairs. Molecular geometry - distribution of nuclei (or atoms) Torsional angle - angle between two bond vectors. Bond length - distance between directly bonded nuclei. Electron pairs repel each other whether they are in chemical bonds or unshared. Lone pair-lone pair > lone pair-bond pair > bond pair-bond pair. Electron pairs assume orientations within a molecule to minimize repulsion between them. Determine the number of electron groups and identify them as bond or lone pairs. To have a complete description of the shape of a molecule, we need to know the bond lengths, the distances between the nuclei of bonded atoms, and the bond angles, the angles between adjacent lines representing bonds. A diatomic molecule has only one bond and no bond angle. Electron pairs repel each other, whether they are in chemical bonds or unshared. Electron pairs assume orientations about an atom to minimize repulsions.
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