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(a) Sodium metal crystallizes in bcc str...

(a) Sodium metal crystallizes in bcc structure. Its unit cell edge length is 420 pm. Calculate its density. (Atomic mass of sodium = 23 u, `N_(A) = 6.022 xx 10^(23) mol^(-)`).
(b) What is Frenkel defect ? How does it affect the density of a crystal ?

Text Solution

Verified by Experts

(a) Density `= (Z.M)/(a^(2) N_(A))`
`= (2 xx 23 xx 10^(-3))/(420 xx 10^(-12) xx 6.022 xx 10^(23))`
`= 1.031 xx 10^(3) kg//m^(3)`
(b) This is a defect caused by the dislocation of a smaller ion from its normal site to an intersitial site.
Density does not change.
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