(Solved): 3. Magnesium oxide has the rock salt crystal structure and a density of \( 3.58 \mathrm{~g} / \mat ...

3. Magnesium oxide has the rock salt crystal structure and a density of \( 3.58 \mathrm{~g} / \mathrm{cm}^{3} \). (a) Determine the unit cell edge length (b) How does this result compare with the edge length as determined from the radii in Table 12.3, assuming that the \( \mathrm{Mg}^{2+} \) and \( \mathrm{O}^{2} \) ions just touch each other along the edges? Table \( 12.3 \) lonic Radii for Several Cations and Anions for a Coordination Number of 6