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If three elements P, Q and R crystallise...

If three elements P, Q and R crystallise in a cubic unit cell with P atoms at the corners, Q atoms at the cubic centre and R atoms at the centre of each face of the cube, then write the formula of the compound.

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Number of P atoms =1
Number of Q atoms =1
Number of R atoms =`1/4xx12`= 3
Formula is `PQR_3`.
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