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Question

A compound is formed by two elements P and Q. Atoms of Q make HCP lattice and those of the element P occupy all the tetrahedral voids. What is the formula of the compound?

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Solution

Once we draw the structure of HCP lattice and consider all the possible tetrahedral voids:
Tetrahedral voids in closed structure = 2 × No. of Q atoms
and thus this possible formula will be P2Q considering an absence of any structural defects.

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