Question

Stacking of square packed layers/sheets exactly above one another gives

• A. AAA.. pattern of arrangement
• B. Simple cubic unit cell
• C. Both (a) and (b)
• D. hexagonal unit cell

Answer 1

The correct option is C Both (a) and (b)

Square packed layers/sheets are placed exactly above one another to get 3-D closed packing. Here, arrangement of spheres is perfectly aligned horizontally as well as vertically.​ The formed lattice has AAA type arrangement where, A is any layer in the packing.​
Lattice thus generated is simple cubic lattice and its unit cell is simple cubic unit cell.

Thus, option (c) is correct.