In BrF5 the central atom is bromine which has the hybridization sp3d2.
Br atom has 7 valence electrons out of which 5 are used to make pair with the F atoms and two are used to make lone pair of electrons.
The lone pair and bond pair repel each other. Thus, the shape is square pyramidal.
The white balls are F atoms and the pink ball is Br atom.
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