Magnesium oxide has the rock salt crystal structure and a density of 3.58 g/cm3. (a) determine the unit cell edge length. (b) how does this result compare with the edge length as determined from the radii in table 3.4, assuming that the mg2+ and o2- ions just touch each other along the edges? the atomic weights for magnesium and oxygen are 24.31 g/mol and 16.00 g/mol, respectively.
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