The coordination numbers in cubic close-packed,body-centered cubic,and primitive cubic structures are,respectively,
A)12,8,and 12.
B)12,8,and 4.
C)8,12,and 6.
D)12,6,and 6.
E)12,8,and 6.

Question

Quizplus · Accepted Answer

In cubic close-packed (ccp) structure, each atom is surrounded by 12 nearest neighbors. In body-centered cubic (bcc) structure, each atom is surrounded by 8 nearest neighbors. In primitive cubic (pc) structure, each atom is surrounded by 6 nearest neighbors. Therefore, the coordination numbers for ccp, bcc, and pc structures are 12, 8, and 6 respectively. The only choice that matches this sequence is choice E, which gives the correct coordination numbers of 12, 8, and 6 for ccp, bcc, and pc structures respectively.

The Coordination Numbers in Cubic Close-Packed,body-Centered Cubic,and Primitive Cubic Structures