NaCl → face-centered cubic (FCC) lattice
ZnS → body-centered cubic (BCC) unit cell
MgO follows an FCC cubic lattice, similar to NaCl structure.
# of atoms = 4 per 1 unit cell
Step 1: Solve for volume using density:
volume = 7.477 x 10-23 cm3/1 unit cell
The unit cell of MgO is shown below.
Does MgO have a structure like that of NaCl or ZnS? If the density of MgO is 3.58 g/cm3, estimate the radius (in centimeters) of the O2- anions and the Mg2+ cations.
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