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A cubic solid is made of two element P a...

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

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Contribution by atoms Q present at the eight corners of the cube `=(1)/(8)xx8=1`
Contribution by atoms P present at the body centre = 1
Thus, P and q are present in the ratio `1:1`.
`therefore` Formula of the compound is PQ.
Co-ordination number of atoms P and Q = 8.
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