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A metallic crystal cystallizes into a lattice containing a sequence of layers `ABABAB…`. Any packing of spheres leaves out voids in the lattice. What

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A metallic crystal cystallizes into a lattice containing a sequence of layers `ABABAB…`. Any packing of spheres leaves out voids in the lattice. What percentage by volume of this lattice is empty spece?
A. `72%`
B. `48%`
C. `26%`
D. `32%`
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Correct Answer - C
AB AB packing is hexagonal close packing in which all atoms occupy 74% of the total space. Hence, 26% of the space is empty or voids.
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