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The Solid State

Short Answer Type

51. An element occurs in the bcc structure. How many atoms are present in its unit cell explain ?

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52. What is the number of atoms per unit cell in a body centred cubic structure?

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53. What are lattice defects imperfection?

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54. what is Frenkel defect.Why is Frenkel defect found in AgCl ?

Frenkel Defect: This defect is shown by ionic solids. The smaller ion (usually cation) is dislocated from its normal site to an interstitial site . It creates a vacancy defect at its original site and an interstitial defect at its new location.
Frenkel defect is shown by ionic substance in which there is a large difference in the size of ions so it is due to difference in size of Ag⁺ and CI^–, Ag⁺ occupies voids.

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