If three elements P, Q and R crystalline in a cubic solid lattice with P atoms of the corners, Q atoms at the cube centres and R atoms at the centre of the edges, then write the formula of the compound.

Explanation

Per Unit Cell,
No. of atoms of `P=8xx1/(8)=1`
No. of atoms of `Q=1xx1=1`
No. of atom of `R=12" edges"xx1/(4)=3`
`therefore` Formula od Compound : `PQR_(3)`