A metallic element crystallizes into a lattice containing a sequence of layers of ABABAB.... Any packing of spheres leaves out voids in the lattice. ≈ what percentage by volume of this lattice is empt

Question

A metallic element crystallizes into a lattice containing a sequence of layers of ABABAB.... Any packing of spheres leaves out voids in the lattice. ≈ what percentage by volume of this lattice is empty space?

Prashant Kotian · Accepted Answer

Correct answer: B. ABABAB... sequence corresponds to HCP. Maximum close-packing fraction = 74%, so empty space = 100% - 74% = 26%.

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