Question

In which cubic lattice does hawleyite crystallize?

• A. Body-centered cubic
• B. Face-centered cubic
• C. Simple cubic
• D. Hexagonal closed packed

Answer 1

Answer: (B)

Face-centered cubic

The number of atoms in a unit cell $=Z=\frac{d\times N_0\times a^3}{M}$
$Z=\frac{4.63\times 6.02\times {10}^{23}\times (587\times {10}^{-10}{)}^3}{144.4}=3.9\approx 4$
Hence, the unit cell is fcc unit cell.