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ChemistryClass 12

In which pair most efficient packing is present.
(a) HCP and BCC
(b) HCP and CCP
(c) BCC and CCP
(d) BCC and simple

Answer

Option (b) is correct.
Most efficient packing is seen in which the percentage of void or the percentage of the empty space is lowest. We can also say that most efficient packing is seen in which the packing fraction is highest.
Packing fraction of simple cubic cell \(= 52\;\%\ \) approx
FCC \(= 74\;\%\) approx
BCC \(= 68\;\%\) approx
HCP\(= 74\;\%\) approx
CCP \(= 74\;\%\) approx
Therefore we can say that FCC, HCP, CCP exhibit more packing fraction or packing efficiency.
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