Question
Chemistry Question on Unit Cells
The correct order of the packing efficiency in different types of unit cells is
A
fcc < bcc < simple cubic
B
fcc > bcc > simple cubic
C
fcc < bcc > simple cubic
D
bcc < fcc > simple cubic
Answer
fcc > bcc > simple cubic
Explanation
Solution
Packing efficiency, for sc unit cell = 54% for bcc unit cell = 68% for fcc unit cell = 74% Thus, the order of packing efficiency is fcc > bcc > sc