PPT Slide

39

• Lone pairs exert stronger repulsive forces than bonding pairs, so to  minimize repulsions, lone pairs occupy equatorial positions.

• With one lone pair present at an equatorial position,  the molecule has a seesaw shape (AX 4E).

• Sulfur tetrafluoride (SF 4), has this shape.

• The equatorial lone  pair repels all four  bonding pairs to  lower the actual  bond angles.

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