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Crystal has face centred cubic structure...

Crystal has face centred cubic structure, having atomic weight `6.023y g mol^-1`. If the minimum distance between two atoms is `y^(1//3)` nm and the observed density is `20 kg m^-3` find type of defect in crystal lattice.

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Since the observed density is greater than the calculated density it indicates that the crystal has metal excess defect due to the presence of extra cations at interstitial sites.
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