Four or Fewer Valence - Four or Fewer Valence-Shell...

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Four or Fewer Valence-Shell Electron Pairs Structural types for molecules or ions which obey the octet rule:
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Note: a double or triple bond is counted as one bonding pair when predicting geometry Using the VSEPR model predict the molecular geometries of a) SnCl 3 - and b) O 3 The Effect of Nonbonding Electrons and Multiple Bonds on Bond Angles The VSEPR model can be used to explain slight distortions from ideal bond geometries observed in some structures. Methane, ammonia and water all have tetrahedral electron-pair geometries, but the bond angles of ammonia and water are slightly distorted from an ideal tetrahedron:
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The bond angles decrease as the number of nonbonding electron pairs increases Since the electron pairs of bonding atoms are somewhat delocalized from the individual atoms (i.e. they are shared by two atoms), whereas the nonbonding electron pairs are attracted to a single nucleus, the nonbonding pairs can be thought of as having a somewhat larger electron cloud near the parent atom (kind of like being a
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Four or Fewer Valence - Four or Fewer Valence-Shell...

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