Question : Which of the following lattices has the highest packing efficiency –

- simple cubic lattice
- body-centred cubic lattice (BCC)
- hexagonal close-packed lattice (HCP)

**Key point to answer this question** : Remember the packing efficiency of all lattices asked in our question which are simple cubic , BCC and HCP lattice. then you can easily crake the question in seconds.

simple cubic has the packing efficiency = 52.4%

body-centred cubic lattice (BCC) has the packing efficiency = 68%

hexagonal close-packed lattice (HCP) has the packing efficiency = 74%

**solution** : After seeing the data of packing efficiencies in given lattices , we can say that hexagonal close-packed lattice (HCP) has the highest packing efficiency that is 74%