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Hexagonal Closet Packaging vs. Cubic Closet Packaging (face-centered) vs. Body-centered

a) Which of the three types of packaging has the least efficient arrangement of atoms? Justify the answer.

b) How do the two more efficient forms of packing compare regarding volume?

c) What is the relationship between coordination number, packing, and density (as mass/volume).

d) State the coordination number of each type of packing, i.e., what is the number of neighbours touching each atom in an infinite array of space lattices?

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