Question

A compound formed by elements A and B crystallizes in the cubic structure where A atoms are at the corners of a cube and B atoms are at the face-centers. The formula of the compound is:

• A. $A{B}_3$
• B. $AB$
• C. $A_{3}B$
• D. $A_2{B}_3$

Answer 1

Answer: (A)

$A{B}_3$

Number of atoms of A $=\frac{1}{8}\times 8=1$
Number of atoms of atoms of B $=\frac{1}{2}\times 6=3$
Therefore, the compound is $A{B}_3$.