Part 06 VSEPR Theory 1 VSEPR Theory V

Part 06 VSEPR Theory

1. VSEPR Theory V Valence S Shell E Electron P Pair R Repulsion

1. VSEPR Theory The shape or geometry of a molecule is determined by the repulsions between the bonding and nonbonding electrons on the central atom. The like-charged electrons try to get as far away from each other as possible and this determines the molecular shape.

a. Method of Determining Shape from VSEPR Theory p. 78 1. Br Br VSEPR Theory is not needed. The molecule must be linear.

2. H H Se AB 2 E 2 Central atom is called A Bonded atoms are called B Nonbonding electrons are called E; counted in pairs Angular shape

3. H H P H AB 3 E Central atom is called A Bonded atoms are called B Nonbonding electrons are called E; counted in pairs Pyramidal shape

4. H H Ge H H AB 4 Central atom is called A Bonded atoms are called B Nonbonding electrons are called E; counted in pairs Tetrahedral shape

5. Cl Cl S AB 2 E 2 Central atom is called A Bonded atoms are called B Nonbonding electrons are called E; counted in pairs Angular shape

Page 82 1. Se C Se AB 2 Linear

2. Cl Cl As Cl Cl Cl AB 5 Trigonal Bipyramidal

3. I AB 3 B I I Trigonal Planar

4. N O Linear

5. F Rn F AB 2 E 3 Linear

p. 45 1. Br F VSEPR Theory is not needed. The molecule must be linear.

2. Br AB 3 B Br Br Trigonal Planar

3. Cl Cl Ge Cl Cl AB 4 Tetrahedral

4. Br Br As Br Br Br AB 5 Trigonal Bipyramidal

5. F F F S F F F AB 6 Octahedral

6. Se Se P AB 2 E Angular