Which of the statements given below is incorrect?

$\text{ONF}$ ($8+7+9=24e^{-}$) and ${\text{NO}}_2^{-}$ ($7+16+1=24e^{-}$) are isoelectronic.${\text{OF}}_2$ is a fluoride of oxygen (Oxygen difluoride), not an oxide of fluorine, because fluorine is more electronegative than oxygen. In nomenclature, the more electronegative element is written last with the suffix '-ide'.$2{\text{HClO}}_4\stackrel{\Delta }{\to }{\text{Cl}}_2{\text{O}}_7+{\text{H}}_2\text{O}$. So ${\text{Cl}}_2{\text{O}}_7$ is the anhydride.${\text{O}}_3$ has a bent shape due to lone pair-bond pair repulsion.