18 - Chemistry 1000 Lecture 18: Molecular shape Marc R....

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Unformatted text preview: Chemistry 1000 Lecture 18: Molecular shape Marc R. Roussel V alence S hell E lectron P air R epulsion Theory I Developed in the mid-20th century by Sidgwick, Powell, Nyholm and Gillespie (McMaster University professor and U. of L. honorary degree recipient) I Key ideas: I Electrons repel. I Valence electrons (bonding and nonbonding) are particularly close together at an end of a bond. I Electrons can be thought of as “living in groups” of nonbonding electron lone pairs and covalent bonds. I A bond of any order (single, double triple) is a single group. I The electronic geometry around an atom is therefore dictated by the mutual repulsion of electron groups near that atom. I Electrons organize themselves so as to minimize the repulsion between groups. Basic VSEPR Geometries Number of groups Shape Name 2 linear 3 o 120 trigonal planar 4 o 109.5 tetrahedral 5 axial o 90 o position equatorial position 120 trigonal bipyramidal 6 o 90 octahedral Examples CO 2 , BF 3 , CH 4 , PCl 5 , SF 6 Lone pairs...
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This note was uploaded on 03/03/2012 for the course CHEM 1000 taught by Professor Marc during the Fall '06 term at Lethbridge College.

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18 - Chemistry 1000 Lecture 18: Molecular shape Marc R....

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