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A cubic solid is made of two elements P ...

A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body -centre. What is the formula of the compound? What are the coordination numbers of P and Q?

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Number of `Q` atoms per unit cell of cube `= (1)/(8) xx 8 = 1`
Number of `P` atoms `= 1//"unit cell`.
The formula of the compound is `PQ` or `QP`.
The coordinate number of each of `P` and `Q` is 8 becuause the crystal has body-centred cubic structure.
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