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How will you distinguish between the fol...

How will you distinguish between the following pairs of terms?
a. Primitive cell and Non-Primitive cell
b. Crystal lattice and unit cell
c. Tetrahedral void octahedral void

Text Solution

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(a) In hexagonal close packing (hcp), the shperes of the third layer are vertically above the spheres of the first layer (ABABAB…..type). On the other hand , in cubic close packing (ccp), the shperes of the fourth layer are present above the spheres of the first layer (ABCABC.....type).
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