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# Iron changes its crystal structure from body-centred to cubic close-packed structure when heated to $916^{\large\circ}C$. Calculate the ratio of the density of the bcc crystal to that of ccp crystal, assuming that the metallic radius of the atom does not change.

Can you answer this question?

$\large\frac{d_{bcc}}{d_{ccp}}=\frac{68}{74}=$$0.919$