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Iron crystallises into a crystal structu...

Iron crystallises into a crystal structure in which the layer of Fe atoms form close-packed arrangement with stacking sequence ABCABC… . What is this close-packed arrangement called? How many Fe atoms are there in the unit cell of Fe crystal?

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The close-packed structure with stacking sequence ABCABC… is called close-packed structure. The unit cell in this close-packed structure is face-centred cubic unit cell. This unit cell contains 4 atoms. Hence, the number of Fe atoms per unit cell in Fe crystal s 4.
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