Molecular + electron pair geometry

• Predict and explain the shape and structure of an molecule:

  1. Has _ regions of electron density
  2. Around central _ atom
  3. These regions repel as far as possible to minimise repulsion
  4. Giving a bond angle of _
  5. And a _ shape
• Electron pair geometry

  Two = Linear

  Three = Trigonal planar

  Four = Tetrahedral

  Five = Trigonal bipyramidal

  Six = Octahedral
• Two regions of e density - 0 LP = linear (180)
• 3 regions of e density - 0 LP = trigonal planar (120)
• 3 regions of e density - 1 LP = bent (118)
• 4 regions of e density - 0 LP = tetrahedral (109.5)
• 4 regions of e density - 1 LP = Pyramidal (107)
• 4 regions of e density - 2 LP = Bent (104.5)
• 5 regions of e density - 0 LP = Trigonal bipyramidal (90 + 120)
• 6 regions of e density - 0 LP = Octahedral (90)