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For plane (1 1 0) of SC having a lattice parameter ‘a’, planar atomic density is given by?

In (110) plane there are \(\frac{1}{4} \times 4 = 1\)atom per unit cell face.

i.e one atom is situated in area √2 a × a = √2a2

Therefore, the number of atoms per square inch which is nothing but its planar density = \(\frac{1}{{1.414{a^2}}} = \frac{{0.707}}{{{a^2}}}\)