A cubic close-packed structure has
A) A coordination number of 4.
B) A coordination number of 6.
C) The same density as a hexagonal close-packed structure.
D) Twice the density of a hexagonal close-packed structure.
E) A coordination number of 8.

Question

Quizplus · Accepted Answer

Cubic close-packed (ccp) structures and hexagonal close-packed (hcp) structures have the same packing efficiency and thus the same density. Both achieve a packing efficiency of approximately 74%.

A Cubic Close-Packed Structure Has