If the radii of $\text{Mg}^{2+}$, $\text{Cs}^+$, $\text{O}^{2-}$, $\text{S}^{2-}$, and $\text{Cl}^-$ ions are $0.65\,\text{\AA}$, $1.69\,\text{\AA}$, $1.40\,\text{\AA}$, $1.84\,\text{\AA}$, and $1.81\,\text{\AA}$ respectively, the coordination numbers of the cations in the crystals of MgS, MgO, and CsCl are respectively