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Which of the following lattices has the ...

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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Packing efficiencies are : Simple cubic= 52.4%, Body-centred cubic=68%, Hexagonal close-packed = 74%. Thus, hexagonal close-packed lattice has the highest packing efficiency
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