Question

A metal crystallises into a lattice containing a sequence of layers as $AB\, AB\, AB$ ... . What percentage of voids are left in the lattice?

• A. 0.72
• B. 0.48
• C. 0.26
• D. 0.32

Answer 1

Answer: (C)

0.26

Answer 2

$ABAB$ packing is hexagonal closepacking in which all atoms occupy $74\%$ of the total space. Hence, $26\%$ of voids are left in the lattice.