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In a compound ,atoms of element Y from c...

In a compound ,atoms of element Y from ccp lattice and those of element X occupy 2/3rd tetrahedral voids.The formula of the compound will be:

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Number of y atoms per unit cell = 4
Number of tetrahedral voids =8
Number of tetrahedral voids occupied by x =`2/3xx8=16/3`
Hence, formula of compound =x:y
`16/3:4` or 16:12 or 4:3 . Hence, compound is `x_4y_3`
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