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Question: Answered & Verified by Expert
The ratio of close-packed atoms to tetrahedral holes in cubic close packing is
ChemistrySolid StateJEE Main
Options:
  • A $1: 1$
  • B $1: 2$
  • C $1: 3$
  • D $2: 1$
Solution:
1665 Upvotes Verified Answer
The correct answer is: $1: 2$
Every constituent has two tetrahedral voids. In $c c p$ lattice atoms
$=8 \times \frac{1}{8}+6 \times \frac{1}{2}=4$
$\therefore$ Tetrahedral void $=4 \times 2=8$,
Thus ratio $=4: 8:: 1: 2$.

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