How many atoms are there in a body-centered cubic unit cell of rubidium?
A)4
B)8
C)6
D)2
E)1

Question

Quizplus · Accepted Answer

In a body-centered cubic (BCC) unit cell, there is one atom at each of the eight corners of the cube and one atom in the center. Each corner atom is shared among eight adjacent unit cells, so each contributes 1/8 of an atom to the unit cell, totaling 1 atom from the corners. The atom in the center is not shared and contributes fully, adding 1 more atom. Therefore, the total is 2 atoms per unit cell.

How Many Atoms Are There in a Body-Centered Cubic Unit