(Solved): An AX ceramic compound has the rock salt crystal structure as shown in the fi ...

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An AX ceramic compound has the rock salt crystal structure as shown in the figure. If the radii of the $$\mathrm{A}$$ and $$\mathrm{X}$$ ions are 0.137 and $$0.241\mathrm{nm}$$, respectively, and the respective atomic weights are 22.7 and $$91.4\mathrm{g}/\mathrm{mol}$$, what is the density (in $$\mathrm{g}/{\mathrm{cm}}^3$$ ) of this material?