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Which of the following lattices has the highest packing efficency (a) simple cubic, (b) body-centred cubic, and (c ) hexagonal close-packed lattice?

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Which of the following lattices has the highest packing efficency (a) simple cubic, (b) body-centred cubic, and (c ) hexagonal close-packed lattice?
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The packing efficiency of the different types of arrangement is :
(i) Simple cubic = `52.4%` (ii) Body-centred cubic = `68%`
(iii) Hexagonal close packed = `74%`
This means that hexagonal close packed arrangement has the maximum packing efficiency `(74%)`.
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