110409a - See-saw y T-shaped y Linear Octahedral...

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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 the bonded pairs are shared. 6. Determine the shape of the molecule by considering the lone pairs invisible.
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Basic Shapes y Linear – y Trigonal Planar – y Tetrahedral – y Trigonal Bipyramidal – y Octahedral –
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Trigonal Planar and Tetrahedral Derivatives y bent – y trigonal pyramidal – y bent –
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Trigonal Bipyramidal Derivatives y Trigonal bipyramidal: y See-saw:
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Unformatted text preview: 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 Polarity y A molecule that has a center of positive charge and a center of negative charge is said to be polar, or to have a dipole moment Which of the following molecules is not polar? 1. HI 2. N 2 3. NO 4. FCl Dipole Moments Dipole Moments Dipole Moments...
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