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The packing efficiency of the two - dimensional square unit cell shown below is

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The packing efficiency of the two - dimensional square unit cell shown below is

a. 39.27 % 

b. 68.02 % 

c. 74.05 % 

d. 78.54 %

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d. 78.54 %

Contact between the spheres is along the diagonal.

4 R = √2 l

l = 2√2 R

Area of Square = I2 = (2√2 R)2 = 8 R2

Area of atoms present in 1 unit cell 

% of packing efficiency

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