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In the crystal structure of metallic Zn,...

In the crystal structure of metallic Zn, the layers of Zn atoms have stacking sequence ABABAB… . What type of close-packed structure is formed in the crystal of Zn? How many Zn atoms are there in the unit cell of Zn crystal?

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In three dimensions, the close-packed structure with stacking sequence ABABAB… is called a hexagonal close-packed structure. The unit cell in the close-packed structure is hexagonal unit cell. This unit cell contains 6 atoms. Hence, the number of Zn atoms per unit cell in Zn crystal is 6.
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