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42

• In molecules with 2 lone pairs and 4 bonding groups,  the lone pairs lie at opposite vertices avoiding strong  lone pair–lone pair 90° repulsions.

• This AX 4E 2 arrangement give rise to the  square planar shape.

• Xenon tetrafluoride (XeF4)  has a square planar shape.

Predicting Molecular Shapes with Five or Six Electron Groups

Problem: Find the molecular shape and predict the bond angles (relative to ideal angles) of (a) SbF 5 and (b) BrF 5.

Solution: (a) For SbF 5. 1. Lewis structure:

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