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4. Calculate the number of unit cells in $0.3\mathrm{g}$ of a species having density of $8.5\mathrm{g}/{\mathrm{cm}}^3$ and unit cell edge length $3.25\times 10^{-8}\mathrm{cm}$. (Ans:1.028 $\times 10^{21}$ ) 5. A compound crystallizes in bee structure. What is the unit cell edge length if the diameter of its atom is $120\mathrm{pm}$ ? (Ans:138.6 pm) 6. Distinguish between crystalline solids and amorphous solids. 7. When gold crystallizes,it forms fec unit cells. The unit cell edge length is $408\mathrm{pm}$.Calculate the density of gold.Molar mass of gold is $197\mathrm{g}/\mathrm{mol}$. (Ans: $19.27\mathrm{g}/{\mathrm{cm}}^2$ ) 8. Explain the terms: a) Substitutional impurity defect b) Interstitial impurity defect.

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Updated on: Feb 15, 2023