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   CCl2CCl2
  0 Trigonal planar   CO3-2
  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 120, 180°  PCl5
  1 Seesaw 102, 173°  SF4
  2 T shaped 86, 172°  BrF3
  3 Linear 180°  I3-
  3 Linear 180°  XeF2
6 0 Octahedral 90, 180° SF6
  1 Square pyramidal 85, 170°  BrF5
  2 Square planar 90, 180°  XeF4
*Steric number (SN) is atoms plus lone pairs

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Lone Pairs    Multiple bonds   Spin   Antialias
This page created by George Lisensky, Beloit College.
Last modified September 22, 2021.
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