Valence Shell Electron Pair Repulsion (VSEPR)
SN*  Lone
pairs 
Molecular Geometry Bond
angle
Example
2 0 Linear 180° HCN
  0 Linear

  CO2
3 0 Trigonal planar 120° H2CO
  0 Trigonal planar   CH2CH2
  1 Angular or bent

  O3
4 0 Tetrahedral 109.5° CH4
  0 Tetrahedral   CH3CH3
  0 Tetrahedral   CH3NH2
  0 Tetrahedral   CH3OH
  1 Trigonal pyramidal   NH3
  1 Trigonal pyramidal   CH3NH2
  2 Angular or bent   H2O
  2 Angular or bent

  CH3OH
5 0 Trigonal bipyramidal  90, 120°  PCl5
  1 Seesaw   SF4
  2 T shaped   BrF3
  3 Linear   I3-
  3 Linear

  XeF2
6 0 Octahedral 90° SF6
  1 Square pyramidal   BrF5
  2 Square planar   XeF4
*Steric number (SN) is atoms plus lone pairs

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Lone Pairs (but not shown for linear molecules)
Double bonds
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This page created by George Lisensky, Beloit College.
Last modified December 16, 2015.
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