In a closed packed array of N spheres, the number of tetrahedral holes is
A
N/2
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B
N
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C
4N
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D
2N
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Solution
The correct option is D2N In a closed packed array of N spheres, the number of tetrahedral holes is 2N and the number of octahedral holes is N. For example, fcc unit cell has 4 atoms per unit cell. It has 4 octahedral and 8 tetrahedral voids.