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

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

Q. Which of the following lattices has the highest packing efficiency :
A) Simple cubic
B) Body-centred cubic
C) Hexagonal close-packed lattice

Q. The packing efficiency of simple cubic $\left(sc\right)$, body centered cubic $\left(bcc\right)$ and cubic close packing $\left(ccp\right)$ lattices follows the order:

Q. The packing efficiency of simple cubic $\left(sc\right)$, body centred cubic $\left(bcc\right)$ and cubic close packing $\left(ccp\right)$ lattices follow the order:

Q. How you distinguish between the following pairs of terms: (i) Hexagonal close-packing and cubic close-packing? (ii) Crystal lattice and unit cell? (iii) Tetrahedral void and octahedral void?