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Problem: Two patterns of packing for two different are shown here. Determine the two-dimensional unit cell for (i).

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Problem Details

Two patterns of packing for two different are shown here.

(i) A 5 by 5 square grid of spheres with spheres alternating between A and B. (ii) Layers consisting of alternating rows of six or five spheres. Layers with 6 spheres alternate between A and B; layers with five spheres are all B.

Determine the two-dimensional unit cell for (i).

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