Consider the species SF4, ClF3, I3^-, XeF2, XeF4, BrF5, XeO3 and PCl5. For those species in which the central atom is sp^3d hybridised and all the…

Hybridisation and shape from VSEPR: $\mathrm{SF_4}$ is $sp^3d$ see-saw (1 lone pair, non-planar). $\mathrm{ClF_3}$ is $sp^3d$ T-shaped (2 lone pairs, planar). $\mathrm{I_3^-}$ is $sp^3d$ linear (3 lone pairs on the central I). $\mathrm{XeF_2}$ is $sp^3d$ linear (3 lone pairs). $\mathrm{XeF_4}$ and $\mathrm{BrF_5}$ are $sp^3d^2$, so they are excluded; $\mathrm{XeO_3}$ is $sp^3$ pyramidal, excluded; $\mathrm{PCl_5}$ is $sp^3d$ trigonal bipyramidal with no lone pair, but it is non-planar and so excluded. The qualifying species are $\mathrm{ClF_3}$, $\mathrm{I_3^-}$ and $\mathrm{XeF_2}$, with lone pairs $2+3+3=8$. The see-saw $\mathrm{SF_4}$ would add one lone pair if the planarity condition were ignored, giving the incorrect total of $9$.