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Q.

Polonium metal crystalises in simple cubic lattice. If packing efficiency of Po in its crystal is
x% and the co-ordination number of Po atom is y, then the value of (x/y) (corrected to
nearest integer) is

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answer is 9.

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Detailed Solution

In simple cubic lattice, packing efficiency is 52%. The co-ordination number of each
atom = 6. x = 52 and y = 6 

xy=526=8.67 ≈9

 

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