(B) The central atom in $BrF_5$ is Bromine $(Br)$,which has $7$ valence electrons.It forms $5$ bonds with $5$ Fluorine $(F)$ atoms and has $1$ lone pa

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(B) The central atom in $BrF_5$ is Bromine $(Br)$,which has $7$ valence electrons.It forms $5$ bonds with $5$ Fluorine $(F)$ atoms and has $1$ lone pair of electrons.The steric number is $5 + 1 = 6$,which corresponds to $sp^3d^2$ hybridization.According to $VSEPR$ theory,a molecule with $5$ bond pairs and $1$ lone pair has a square pyramidal geometry.