1. Valence Shell Electron Pair Repulsion Theory
VSEPR Theory
Valence Shell Electron Pair Repulsion Theory

2. Linear A – A A – X X – A – X A2 or AX (diatomic) AX2 (triatomic)
1 or 2 shared pairs
NO unshared pairs on central atom
Bond angle: 180o

3. Bent AX2 2 shared pairs SOME unshared pairs on central atom
Bond angle: less than 180o

4. Trigonal Planar AX3 3 shared pairs NO unshared pairs on central atom
Bond angle: 120o

5. Trigonal Pyramidal AX3 3 shared pairs
SOME unshared pairs on central atom
Bond angle: less than 120o

6. Tetrahedral AX4 4 shared pairs NO unshared pairs on central atom
Bond angle: 109.5o

7. Trigonal Bipyramidal AX5 5 shared pairs
NO unshared pairs on central atom
Bond angle: 90o and 120o

8. Octahedral AX6 6 shared pairs NO unshared pairs on central atom
Bond angle: 90o