1. Shape of the Molecule Use VSEPR Theory
Valance Shell Electron Pair Repulsion
Bond angles, geometry
Steric number = # bond to central atom + # lone pair to central atom
Rules:
Carbon will always be the central atom
Double bond, triple bonds will count as 1 bond

2. Shape of Molecule
CH4
SN = = 4
Shape: tetrahedral
Angel: 109.5o

3. Shape of Molecule C2H4 CH2O SN = 3 + 0 = 3 Shape: Trigonal Planar
Angel: 120o

4. Shape of Molecule
C2H2
SN = = 2
Shape: Linear
Angel: 180o

5. Bond Types and Bond Strength
Bond type determines strength/length
Bond Strength
Bond length