CHEM 1031 Lecture 33: 12/2/2016 VSEPR Theory
Document Summary
7. 6 molecular structure and polarity: vsepr theory, valence shell electron-pair repulsion theory: assumes electron bonds will arrange in a way that they will not be heavily repelled by each other. Increase distance: not wholly accurate: there are other attractions and repulsions in the molecule, electron-pair geometry: the geometry that includes all the electron pairs. Trigonal bipyramidal: 5 regions: octahedral: 6 regions, electron-pair geometry versus molecular structure, molecular structure and electron-pair geometry are not the same thing, will differ due to lone pair electrons, molecular structure, order of repulsions. Lone pair-lone pair>lone pair-bonding pair> bonding pair-bonding pair: order of spacing. In a trigonal bipyramid, lone pairs should be in an equatorial position. In an octahedral, with two lone pairs, lone pairs should be on the opposite sides of the central atom: molecular polarity, bond dipole moment ( ): happens when they are charges in the molecule. In diatomic molecules, the bond moment will determine molecular polarity.
