please help me with these questions For the questions 10-12 of hexagonal close packed (HCP) structure...

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For the questions 10-12 of hexagonal close packed (HCP) structure in Exp. 9 Crystal Structure, show your answers with detaile

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Answer 1

Answer #1

10. The total number of spheres within the unit cell =

3 + (1/2)×2 + (1/6)×6×2 = 6

11. The volume of spheres in unit cell = (4π/3)r³ (3+3) = 8πr³

12. Coordination of a sphere in a close-packed structure = 12

It follows ABC kind of packing

where B layers are kept over the voids of the A layer

Thus the middle atom of the A layer is surrounded by 6 adjacent atoms

3 atoms from the top & bottom layer each.

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Answer 2

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