A FCC unit cell has a lattice constant a=4.0×10^-10m.Calculate the density of atoms per unit length in direction [110] and [111].
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Explanation:
Ions aren't the same size as the atoms they come from. Compare the sizes of sodium and chloride ions with the sizes of sodium and chlorine atoms. Positive ions are smaller than the atoms they come from. Sodium is 2,8,1; Na+ is 2,8.
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