The Crystalline Structure Known as Hexagonal Close-Packed

Multiple Choice

The crystalline structure known as hexagonal close-packed

A) is characterized by the stacking of identical spheres.
B) occurs when every ion has eight nearest-neighbor ions of opposite charge.
C) corresponds to an alternating pattern of ions.
D) occurs when an ion of either kind has six nearest neighbors of the other kind.
E) None of these is correct.