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.

If three elements P, Q and R crystallise in a cubic unit cell with P a

1.	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.
Answer» Contribution made by the atoms of P present in all eight conrners of the cube `=1//8xx8=1` Contribution made by the atoms of Q present in the centre of body = 1 Contribution made by the atoms of R present at all the six faces `=1//2xx6=3` `therefore` Formula of the compound = `PQR_(3)`

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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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