A metallic element crystallizes into a lattice containing a sequence of layers of ABABAB.... Any pac — Solid State Chemistry Question
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. Approximately what percentage by volume of this lattice is empty space?
Answer: B
💡 Solution & Explanation
The ABABAB... sequence corresponds to Hexagonal Close Packing (HCP). The packing fraction or efficiency for HCP is 74%. The percentage of empty space (voids) is $100\% - 74\% = 26\%$. Therefore, correct answer is B.
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