molecular shapes

• 1. find the number of electron pairs
• 2. determine how many of the pairs are bonding and how many are lone pairs
• 3. bonding pairs indicate the basic shape and lone pairs indicate any additional repulsion
• linear 


  bp = 2; lp = 0; angle = 180
• v-shaped


  bp = 2; lp = 2; angle = 104.5
• trigonal planar


  bp = 3; lp = 0; angle = 120
• triangular pyramid


  bp = 3; lp = 1; angle = 107
• tetrahedral


  bp = 4; lp = 0; angle = 109.5
• trigonal bipyramidal


  bp = 5; lp = 0; angle = 90 & 120
• octahedral


  bp = 6; lp = 0; angle = 90