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Packing Fraction and Efficiency

In a cube, X ...

Question

In a cube, X atoms are present at corners and Y atoms are at face centres of a cube. The number of X and Y are:

A

8, 8

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B

6, 8

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C

8, 6

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D

6, 6

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Solution

The correct option is C $8, 6$
No. of corner position in a cube= 8
No. of face centres present in a cube=6
$X = 8, Y = 6$

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