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Define packing efficiency....

Define packing efficiency.

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The percentage of total volume occupied by these constituent spheres gives the packing efficient of an arrangement. Packing efficiency in simple cubic arrangement.
{Packing fraction ( or ) efficiency } `= ( { "Total volume occupied by spheres in a unit cell"})/("Volume of the unit cell") xx 100`
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(i) Define coordination number. (ii) Calculate the packing efficiency in fcc unit cell?

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Assertion (A) : The packing efficiency is maximum for the fcc structure. Reason ( R ) : The co-ordination number is 12 in fcc structure.