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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 atoms of P =`8xx1/8`=1
Number of atoms of Q =1 x 1 =1
Number of atoms of R = `6 xx 1/2`=3
hence, compound is `PQR_3`.
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