The shape of $\mathrm{X}\mathrm{e}\mathrm{O}{\mathrm{F}}_4$ by VSEPR theory is:

The $\%$ ionic character of the binary compound $\mathrm{A}-\mathrm{B}$ is given by $\%$ ionic character $=16\left({\mathrm{X}}_{\mathrm{A}}-{\mathrm{X}}_{\mathrm{B}}\right)+3.5{\left({\mathrm{X}}_{\mathrm{A}}-{\mathrm{X}}_{\mathrm{B}}\right)}^2$

Which of the following compound is more than $50\%$ ionic?

The total number of valance ${\mathrm{e}}^{-}$ in $2.6 \mathrm{g}$ of ${\mathrm{N}}_3^{-}$ ........