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What is unit cell ? Write formula to cal...

What is unit cell ? Write formula to calculate the density of a unit cell.

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It is the smallest repeating structural unit of a crystalline solid (or crystal lattice ) which repeated in different directions produces the crystalline solid (lattice).
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The formula for determination of density of unit cell is

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How is simple cubic unit cell formed ? Calculate the number of atoms in a simple unit cell.

The formula for determination of density of cubic unit cell is :

An element A (Atomic weight =100 ) having b.c.c. structures has unit cell edge length 400 pm. Calculate the density of A. number of unit cells and number of atoms in 10 g of A.

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