Stacking of square packed layers/sheets exactly above one another give(s)

AAA.. pattern of arrangement

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ABAB.. pattern of arrangement

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hexagonal unit cell

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Simple cubic unit cell

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Solution

The correct option is D Simple cubic unit cell
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 (a) and (d) are correct.

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