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Arrange the following accroding to their...

Arrange the following accroding to their packing fraction:
simple cubic, face-centred cubic , body -centred cubic.

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Simple (0.52 ) lt body-centred (0.68) lt face-centred (0.74 )
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  17. Why stoichiometric defects are also called intrinsic defects?

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  19. Schottky defect.

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