shapes

• Tetrahedral

  bonded pairs = 4

  lone pairs = 0

  angle = 109.5
• pyramidal

  bonded pairs = 3

  lone pairs = 1

  angle = 107
• non-linear

  bonded pairs = 2

  lone pairs = 2

  angle = 104.5
• lone pairs repel more strongly than a bonding pair
• the bond angle is reduced by 2.5 for each lone pair
• linear

  bonding pairs/regions = 2

  lone pairs = 0

  angle = 180
• trigonal planar

  bonding regions = 3

  lone pairs = 0

  angle = 120
• tetrahedral

  bonding regions = 4

  lone pairs = 0

  angle = 109.5
• octahedral

  bonding regions = 6

  lone pairs = 0

  angle = 90