At a concentration of ${10}^{-3} \text{M}$, a detergent $\left({\text{C}}_{12}{\text{H}}_{25}{\text{SO}}_4^{-}{\text{Na}}^{+}\right)$ solution becomes a colloidal solution. On an average ${10}^{\mathrm{13 }}$colloidal particles are present in $1 {\text{mm}}^3$. Calculate the average number of ions contained in one colloidal particle (micelle)? [Given ${\text{N}}_{\text{A}}=6\times {10}^{23}$]