69. Which of the following statements is false?
(A) The layering in a hexagonal closest-packed structure is aba.
(B) A body-centered cubic unit cell has two atoms per unit cell.
(C) For unit cells having the same edge length, a simple cubic structure would have a smaller
density than a body-centered cube.
(D) The size of tetrahedral hole is always larger than the size of octahedral hole.
(E) Atoms in a solid, consisting of only one element would have six nearest neighbors if the
crystal structure was a simple cubic array.
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