Question

In which pair most efficient packing in present?

• A. $hcp$ and $bcc$
• B. $hcp$ and $ccp$
• C. $bcc$ and $ccp$
• D. $bcc$ and simple cubic cell

Answer 1

The correct option is B $hcp$ and $ccp$

The packing efficiency of the lattices are given below.

$hcp$ = $74\%$

$ccp$ = $74\%$

$bcc$ = $68\%$

Simple cubic = $54\%$.

So, the pair with most efficient packing is $hcp$ and $ccp$.

Hence, Option "B" is the correct answer.