The following is the shape of molecular shape.
AX4 : Tetrahedral
AX3E : Trigonal pyramidal
AX3E2 : T-shaped
AX2E3 : Linear
Here E represent lone pair electrons and A represent central atom and X represent bonded atom.
A molecule will adopt that shape in which lone pairs are present at maximum distance in order to have least repulsion. Thus, lone pairs are present in the at equatorial position in Trigonal bipyramidal structure to give molecular shape to the molecule.
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