Discussion
What is the shape of chlorine trifluoride?
Answer: B
Chlorine trifluoride is T-shaped.
The chlorine atom in ClF3 has 7 valence electrons: three form bonds with fluorine and four remain as two lone pairs. That is five electron pairs, arranged in a trigonal bipyramid. The two lone pairs take equatorial positions to minimise repulsion, leaving the three fluorine atoms in a T shape.
Trigonal planar would need three bond pairs and no lone pairs (as in BF3). Tetrahedral, see-saw and square pyramidal shapes come from four, five and six electron pairs with different numbers of lone pairs.
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