MnO has either the NaCI type structure or the CsCI type structure. The edge length of the MnO unit cell is 4.47 xlO^-8 cm, and the density of MnO is 5.28 g/cm^3. (a) Does MnO crystalize in the NaCI or the CsCI type structure? (b) Assuming that the ionic radius of oxygen is 140. pm, estimate the ionic radius of manganese