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Three elements P , Q and R crystallise i...

Three elements P , Q and R crystallise in a cubic solid lattice with P atoms at corners, Q atoms at body-centre and R atoms at the centre of edges , 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)/(4)xx12=3`.
Formula is `PQR_(3)`.
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