Which two crystal lattices have the same atomic packing fraction?

Identify this crystal structure. 

What are the Miller indices for the shaded plane shown in the figure? (negative number represents overhead bar)

Compute the percent of ionic character in GaP.

Which of the following bonds are the only primary bonds that are directionally dependent?

How many formula units are contained within this unit cell?

Calculate the density (in g/cm3) of FCC Copper with an atomic radius of 0.1278 nm.

Compute the percent of ionic character in ZnTe

Calculate the energy (in Joule) of attraction between a cation with a valence of +3 and an anion with a valence of -3, the centers of which are separated by a distance of 5.0 nm.

Identify this crystal structure.