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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 spece?

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The empty space in h.c.p. or c.c.p. arrangement is same as for f.c.c.
25.94%
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