Three elements P,Q and R crystallize in ...

Three elements `P,Q` and `R` crystallize in a cubic solid lattice. The `P` atoms occupy the corners. `Q` atoms the cube centres and `R` atoms the edges. The formula of the compound is

A

PQR

B

`PQR_(2)`

C

`PQR_(3)`

D

`PQ_(3)R`

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