Which of the following lattices has the highest packing efficiency ? (i) simple cubic (ii) body-centred cubic (iii) hexagonal close-packed lattice.

Which of the following lattices has the highest packing efficiency ? (

1.	Which of the following lattices has the highest packing efficiency ? (i) simple cubic (ii) body-centred cubic (iii) hexagonal close-packed lattice.
Answer» SOLUTION :Packing EFFICIENCIES are : Simple cubic= 52.4%, Body-centred cubic=68%, Hexagonal close-packed = 74%. Thus, hexagonal close-packed LATTICE has the highest packing EFFICIENCY