A cubic solid is made up of two elements P and Q

CBSE Class 12 CBSE Class 12 Chemistry
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1

A cubic solid is made up of two elements P and Q. Atom Q is present at corners of the cube and atom P at the body centre. What is the formula of the compound? What are the coordination numbers of P and Q ?

2

Number of Q atoms per unit cell = 1/8 X 8 = 1 Number of P atoms per unit cell = 1x1=1
Ratio of atoms P : Q = 1:1
Hence, the formula of the compound is PQ.
As it is a bcc lattice therefore, coordination number is 8 for both P and Q.