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The efficiency of packing in the case of a metal crystal for face-centered cubic is

Correct answer

74

Step-by-step solution

In face centred cubic, packing efficiency = Volume occupied by 4 atoms in the unit cell × 1 0 0 Volume of the unit cell = 4 × 4 / 3 πr ⁡ 3 × 100 2 2 r ⁡ 3 = 16 / 3 πr ⁡ 3 × 100 16 2 r ⁡ 3 = 74 %

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