The $\mathrm{HNH}$ bond angle in ${\mathrm{NH}}_3$ is greater than $\mathrm{HAsH}$ angle in ${\mathrm{AsH}}_3$.

The number of species which does not exist among the following

${\mathrm{XeF}}_3^{-}, {\mathrm{SH}}_6, {\mathrm{XeF}}_5 , {\mathrm{NCl}}_5, {\mathrm{PCl}}_5, {\mathrm{PCl}}_3, {\mathrm{XeF}}_3$