For each of the following, determine the crystal structure that best matches the description.

1. Closest packed structure where atom layers stack in ABABABAB pattern

2. Closest packed structure where atom layers stack in ABCABCABC pattern

3. Closest packed planes are the family of {110} planes.

4. Rare cubic crystal structure, only Polonium has this structure.

5. Crystal structure of iron below 912 degrees Celsius.

OPTIONS: A. BODY-CENTERED CUBIC

B. FACE CENTERED CUBIC

C. HEXAGONAL CLOSE PACKED

D. SIMPLE CUBIC

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