# Question

MnO has either the NaCl type structure or the CsCl type structure. The edge length of the MnO unit cell is 4.47 × 10–8 cm, and the density of MnO is 5.28 g/cm3.
a. Does MnO crystallize in the NaCl type or the CsCl type structure?
b. Assuming that the ionic radius of oxygen is 140 pm, estimate the ionic radius of manganese.
c. Does the calculated cation-to-anion radius ratio for MnO substantiate your answer in part a? Explain.

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