Question

Packing efficiency of hcp structure is _________.

• A. $68\%$
• B. $52.4\%$
• C. $74\%$
• D. $82\%$

Answer 1

The correct option is C $74\%$

Both ccp and hcp are highly efficient lattice; in terms of packing. The packing efficiency of both types of close packed structure is 74%, i.e. 74% of the space in hcp and ccp is filled. The hcp and ccp structure are equally efficient; in terms of packing.

The packing efficiency of simple cubic lattice is 52.4%. And the packing efficiency of body centered cubic lattice (bcc) is 68%.