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 12.3, assuming that the Mg²⁺ and O^2- ions just touch each other along the edges?

Transcribed Image Text:

Ionic Radius fonic Radius Cation Anion (nm) (nm) AP+ Ba+ Ca+ Br 0.053 0.196 0.181 0.136 CI- 0.133 0,220 F- 0.100 0.170 Cs* Fe+ Fe K+ 0.077 0.140 0.184 0.069 0.138 0.072 0.067 Mg+ Mn2+ Na* Ni² Sit+ 0.102 0.069 0.040 0.061