How will you distinguish between the following pairs of thrI) Hexagonal close packing and cubic close packing?

How will you distinguish between the following pairs of thrI) Hexagona

1.	How will you distinguish between the following pairs of thrI) Hexagonal close packing and cubic close packing?
Answer» . Stacking Sequence of Layers-HCP layers cycle between two equivalent shifted layers in an ABABAB sequence-CCP layers cycle among three different layers in an ABCABC sequenceSimilarities and Difference Between the FCC and HCP Structure2. Shape of the Unit Cells- HCP structures have hexagonal unit cells characterized by a diamond shaped or hexagonal base with sides of equal length-CCP structures have cubic unit cellsHexagonal Unit Cell3. Volume of Unit Cells-HCP unit cells have a volume which can be calculated with the equation V=24sqrt(2)r^3 in which r = the atomic radius-CCP unit cells have a volume which can be calculated with the equation V=8sqrt(8)r^3 in which r = the atomic radiusHexagonal Close Packing4. Number of Atoms per Unit Cell-HCP unit cells contain 6 atoms-CCP unit cells contain 4 atoms