NSCI 1321 Lecture Notes - Lecture 20: Antibonding Molecular Orbital, Molecular Orbital Theory, Vsepr Theory
2 Jan 2017
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Chapter 10 molecular bonding and chemical bonding theory. Molecular geometry is the general shape of a molecule, as determined by the relative positions of the atomic nuclei. The vsepr model considers a double or triple bond as though it were one lone pair. When resonance structures are required for the electron-dot diagram, you can choose any one to determine the electron-pair arrangement and the molecular geometry. Write the electron-dot formula from the formula. Based on the electron-dot formula, determine the number of electron pairs around the central atom (including bonding and nonbonding pairs). Determine the arrangement of the electron pairs about the central atom. Obtain the molecular geometry from the directions of the bonding pairs for this arrangement. The angles 180 , 120 , 109. 5 , and so on are the bond angles when the central atom has no lone pair and all bonds are with the same other atom.
