Question

A metal crystallises into a lattice containing a sequence of layer as $ABABAB....$. What percentage of voids are left in the lattice?

• A. $72\%$
• B. $48\%$
• C. $26\%$
• D. $32\%$

Answer 1

The correct option is C $26\%$

$ABAB.....$ packing is hexagonal close packing in which all atoms occupy $74\%$ of the total.

Hence, $26\%$ of the space is empty or voids.

Hence, Option "C" is the correct answer.