Cards (5)

  • Electron pair Repulsion theory states:
    1. Each electron pair around the central atom repels all other electron pairs.
    2. Therefore, electron pairs take up positions as far apart as possible in order to minimalize repulsion.
  • Central atom with 3 electron pairs:
    electron pairs arrange themselves in a triangular shape with Bond angles of 120 degrees
    This is a Trigonal Planar shape
  • If Central atom has 4 electron pairs:
    4 electron pairs around the central atom form a tetrahedral shape
    All the bond angles in a tetrahedral are 109.5 degrees
  • If Central atom has 5 electron pairs:
    In order to minimalize repulsion 5 electrons arrange themselves,
    3 electron pairs on central atoms on the plane form a triangle with bond angles of 120 degrees
    2 electron pairs opposite central plane (Above and Below) form a bond angles of 90 degrees
  • If Central atom has 6 electron pairs:
    6 electrons pairs around the central atom form a octahedral shape
    1. 2 electron pairs above and below the central plane form a bond angle of 90 degrees
    2. 4 electron pairs on the central plane form a bond angle of 90 degrees