1. For some hypothetical metal the equilibrium number of vacancies at 750°C is 2.8×1024?−3. If the density and atomic weight of this metal are 5.60 ? ??3⁄ and 65.6 ?/???, respectively, calculate the fraction of vacancies for this metal at 750°C.

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Crystalline Imperfections

The crystalline imperfections are described as the geometrical defects in the crystal due to incorrect arrangement of atoms, impurity, vacancy, and many more. It is not possible to achieve a perfect or ideal crystal, practically.