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Question
The ratio of close-packed atoms to tetrahedral holes in cubic close packing is ____________.
Options
1 : 1
1 : 2
1 : 3
2 : 1
MCQ
Fill in the Blanks
Solution
The ratio of close-packed atoms to tetrahedral holes in cubic close packing is 1 : 2.
Explanation:
In ccp, each member species has two tetrahedral voids.
In ccp, lattice atoms = `8 xx 1/8 + 6 xx 1/2` = 4
∴ Number of tetrahedral voids = 4 × 2 = 8
Thus, ratio = 4 : 8 : : 1 : 2
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Packing of Particles in Crystal Lattice
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