The number of species from the following which have square pyramidal structure is ______
PF$$_5$$, BrF$$_4^-$$, IF$$_5$$, BrF$$_5$$, XeOF$$_4$$, ICl$$_4^-$$

Given species:

$$PF_5,\; BrF_4^{-},\; IF_5,\; BrF_5,\; XeOF_4,\; ICl_4^{-}$$

For $$PF_5$$,

Central atom phosphorus has: $$5 \text{ bond pairs and }0 \text{ lone pair}$$

Geometry: $$\text{Trigonal bipyramidal}$$

Hence, not square pyramidal.

For $$BrF_4^{-}$$,

Total electron pairs around Br: $$4 \text{ bond pairs } + 2 \text{ lone pairs}$$

Geometry: $$\text{Square planar}$$

Hence, not square pyramidal.

For $$IF_5$$,

Total electron pairs around I:$$5 \text{ bond pairs } + 1 \text{ lone pair}$$

Electronic geometry: $$\text{Octahedral}$$

Shape:$$\text{Square pyramidal}$$

For $$BrF_5$$,

Total electron pairs around Br: $$5 \text{ bond pairs } + 1 \text{ lone pair}$$

Shape: $$\text{Square pyramidal}$$

For $$XeOF_4$$,

Total electron pairs around Xe: $$5 \text{ bond pairs } + 1 \text{ lone pair}$$

Shape: $$\text{Square pyramidal}$$

For $$ICl_4^{-}$$,

Total electron pairs around I: $$4 \text{ bond pairs } + 2 \text{ lone pairs}$$

Shape: $$\text{Square planar}$$

Species having square pyramidal structure:

$$IF_5,\; BrF_5,\; XeOF_4$$

Therefore, number of such species:$${3}$$