The number of species trom the following carrying a single lone...

The central $Xe$ atom in ${XeO}_{3}$ has three bonding domains and one lone pair of electrons. Hence, the electron geometry is tetrahedral and molecular geometry is pyramidal.

${XeO}_{2}{F}_{2}$ is trigonal bipyramidal and the shape is a see-saw.

${XeOF}_{4}$ is in square pyramidal shape.

So, ${XeF}_{5}^{+}, {XeO}_{3}, {XeO}_{2}{F}_{2}$ and ${XeOF}_{4}$ have single lone pair on central atom.