A metallic element crystallizes into a lattice containing a sequence of layers of ABABAB. Any packing of sphere leaves out voids in the lattice. What percentage by volume of this lattice is occupied by voids?
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Solution
ABABAB type of arrangement corresponds to hcp or hexagonal close packed structure. For such a structure, the occupied space is 74%. Hence, 100−74=26% by volume of this lattice is occupied by voids.