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Predicting Molecular Geometries

Predicting Molecular Geometries - molecular geometry from...

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Predicting Molecular Geometries In Lewis structures there are two types of valence electron pairs: bonding pairs (shared by atoms in bonds) nonbonding pairs (also called lone pairs) The Lewis structure of ammonia: Three bonding pairs of electrons One nonbonding pair of electrons The electron shell repulsion between these four electron pairs is minimized in a tetrahedral arrangement (i.e. the "electron pair geometry" is tetrahedral) This arrangement is for the valence electron pairs . What about the atoms in a compound? The molecular geometry is the location of the atoms of a compound in space We can predict the
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Unformatted text preview: molecular geometry from the electron pair geometry • In the above example (ammonia), we would predict that the three hydrogens would form the vertices of a tetrahedron, and the nonbonding electron pair the fourth. Thus, ammonia would have a trigonal pyramide arrangement of its H atoms Steps involved in determining the VSEPR model: 1. Draw the Lewis structure 2. Count total number of electron pairs around the central atom. Arrange them to minimize the electron shell repulsion 3. Describe the molecular geometry in terms of the angular arrangement of the bonding pairs...
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