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A metallic crystal cystallizes into a la...

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 space?

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The AB AB AB ….. Type arrangement is known as hcp packing. For hcp, the packing fraction is `0.74`. This means that the empty space is `0.26` or `26%`.
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