1.

The density of `Cr` atoms is `7.02g//cm`. If the unit cell has edge length `289p m`. Calculate the number of chromium atoms per unit cell. `(at ` masss of `Cr=52)`.

Answer» Correct Answer - 2
Density `rho=(zxxat. wt.)/(a^(3)xxN_(A))`
`z=(rhoxxa^(3)xxN_(A))/(at.wt.)`
`=(7.2xx(289xx10^(-10))^(3)xx6.023xx10^(23))/(52)`
`:. n=2`


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