VSEPR

1
VSEPR
2
(No Transcript)
3
Valence Shell Electron Pair Repulsion

• Electron pairs orient themselves so as to make
  the angles between themselves as large as
  possible
• This includes bonded as well as non-bonded pairs

4
Molecular Geometry

• Non-bonded pairs are not seen on the molecule but
  they do affect it
• In determining molecular geometries, multiple
  bonds are considered like single bonds
• Six types of molecular geometries

5
Linear

• Two bonded pair and no non-bonded pairs on
  central atom
• 180

6
Trigonal Planer

• Three bonded pair and no non-bonded pairs
• 120 between bonds

7
Bent

• Two bonded pair and one non-bonded pair
• 120 between bonds

8
Tetrahedral

• Four bonded pairs
• 109.5 between bonds

9
Trigonal Pyramidal

• Three bonded and one non-bonded
• 109.5 between bonds

10
Bent

• Two bonded and two non-bonded
• 104.5 between bonds

11
Non-Bonding Pairs

• Exert greater repulsive forces on adjacent pairs
  than bonded electrons do
• Example All of these have tetrahedral electron
  pair geometries
• CH4 109.5
• NH3 107
• H2O 104.5

12
More Geometries of Expanded Octets