Question 2: 1- Show that MgO, and KCl have the crystal structure of sodium chloride and cesium chloride, respectively. 2- Calculate the density, and the packing factor of each crystal. Given: r(K+)=0.133nm,r(Cl)=0.181nm,r(Mg+2)=0.066nm, and r(O2)=0.132nm. M(K)=39.1g/mol,M(Cl)=35.5g/mol,M(Mg)=24.3g/mol, and M(O)=16g/mol