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Which of the following lattice has the h...

Which of the following lattice has the highest packing efficiency (i) simple cubic (ii) body-centred cubic (iii) hexagonal close-packed lattice.

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Hexagonal close-packed lattice has the highest packing efficiency. Its packing efficiency is 74%. In case of simple cubic and body-centred cubic lattices, the packing efficiencies are 52.4% and 68% respectively.
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