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Which of the following lattices has the...

Which of the following lattices has the highest packing efficiency ?
i) Simple cubic `" "` ii) Body- centred cubic `" "` iii) Hexagonal close-packed lattice
Packing efficiency in
i) Simple cubic lattice = 52.4 %
ii) body-centred cubic lattice = 68 %
iii) Hexagonal close-packed lattice = 74 %

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Hexagonal closed packed lattice has the highest packing efficiency (74%)
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