110508 - the bonded pairs are shared. 6. Determine the...

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VSEPR y V alence S hell E lectron P air R epulsion y Electron pairs repel each other. y All electron pairs in bonds and lone pairs must be considered y The pairs orient themselves to minimize their repulsions y Lone pairs require more space than bonding pairs y Multiple (double or triple) bonds count are treated as one electron domain, like a single bond
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Electron Distribution
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Definitions y Steric Numbers – sum of bonded and lone pairs around an atom (multiple bonds count as one) y Electron Domains – same as steric number y Molecular Shape – shape formed by the central atom and the other nuclei
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Predicting VSEPR Structure 1. Draw the best Lewis structure. Use expanded shell if necessary. 2. Consider both bonding and lone pairs to get the number of electron domains. 3. Put pairs as far apart as possible. 4. Put lone pairs in positions with the most space. 5. Determine the positions of the atoms from the way
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Unformatted text preview: the bonded pairs are shared. 6. Determine the shape of the molecule by considering the lone pairs invisible. Bond Angles PCl 6-Possible Arrangements for XeF 4 Possible Arrangements for I 3-Trigonal Bipyramidal Derivatives y Trigonal bipyramidal: y See-saw: y T-shaped: y Linear: Octahedral Derivatives y Octahedral: y Square pyramidal: y Square planar: y T-shaped: y Linear VSEPR Summary 90 o T-shaped 3 6 # electron domains # bonding e-domains Molecular Shape Bond Angles 2 2 linear 180 o 3 3 trigonal planar 120 o 3 2 bent 120 o 4 4 tetrahedral 109.5 o 4 3 trigonal pyramidal (107 for NH 3 ) 109.5 o 4 2 bent (104.5 o for H 2 O) 109.5 o 5 5 trigonal bypyramidal 120 o /90 o 5 4 see-saw 120 o /90 o 5 3 T-shaped 90 o 5 2 linear 180 o 6 6 octahedral 90 o 6 5 square pyramidal 90 o 6 4 square planar 90 o 6 2 linear 180 o...
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This note was uploaded on 12/06/2009 for the course CHEM 105A taught by Professor Bau during the Fall '04 term at USC.

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110508 - the bonded pairs are shared. 6. Determine the...

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