Which of the following is not true about

Question:

Which of the following is not true about the voids formed in 3-dimensional

hexagonal close-packed structure?

(i) A tetrahedral void is formed when a sphere of the second layer is present

above triangular void in the first layer.

(ii) All the triangular voids are not covered by the spheres of the second

layer.

(iii) Tetrahedral voids are formed when the triangular voids in the second

layer lie above the triangular voids in the first layer and the triangular

shapes of these voids do not overlap.

(iv) Octahedral voids are formed when the triangular voids in the second

layer exactly overlap with similar voids in the first layer

Solution:

Option (iii) and (iv) are the answers.

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