What is the difference between trigonal pyramid and trigonal bipyramid shape. Plx explain wih examples.

Dear student

Trigonal pyramidal and trigonal bipyramid structures differ from each other, in the way that trigonal pyramidal structure has a triangular base and a pyramid on top, whereas, the trigonal bipyramidal structure has two pyramids , one on top and one on bottom of the triangular base.

In ammonia, four pairs of electrons (three bonding pairs and one non-bonding lone pair) repel each other, giving the molecule its pyramidal shape
Ammonia is triangular pyramidal in shape.

In SF4 molecule, the central atom, is S which has 6 valence electrons, out of which 4 electrons form bonds with four F atoms, and two electrons remain as lone pair. 
Thus, the structure becomes trigonal bipyramidal .


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