1.

A compund is made of two elements `P` and `Q` are in `ccp` arrangement while atoms `P` occupy all the tetrahedral voids. What is the formula of the compound?

Answer» First method
Number of `Q` atoms in `c cp = 4//"unit cell"`
Number of `TV_(s) = 8//"unit cell"`
Number of `OV_(s) = 4//"unit cell"`
Number of `P` atoms `=` Number of `TV_(s) = 8`
Thus Formula`= P_(8) Q_(4) implies P_(2)Q`
Second method
Let number of `Q` atom in `c cp = 1//"atom"`
Number of `TV_(s) = 2//"atom"`
Number of `OV_(s) = 1//"atom"`
Number of `P` atoms `=` Number of `TV_(s) = 2`
Thus, formula `= P_(2)Q`


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