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

Options

A. PQR
B. `PQR^(2)`
C. `PQR_(3)`
D. `PQ_(3)R`

Explanation

To determine the formula of the compound formed by the elements P, Q, and R in a cubic solid lattice, we need to analyze the contribution of each type of atom based on their positions in the lattice.

### Step-by-Step Solution:

**Step 1: Analyze the Position of P Atoms**
- The P atoms are located at the corners of the cube.
- There are 8 corners in a cube.
- Each corner atom contributes \( \frac{1}{8} \) of an atom to the unit cell.
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