Question

A compound formed by elements A and B crystallizes in the cubic arrangement in which A atoms are at the corners of a cube and B atoms are at the face centres. What is the formula of compound?

• A. $ A{{B}_{3}} $
• B. $ B{{ }_{3}}A $
• C. $ {{A}_{2}}{{B}_{2}} $
• D. $ A{{B}_{2}} $
• E. $ A{{B}_{4}} $

Answer 1

Answer: (A)

The number of A atoms in the unit cell = 8/8 =1 The number of B atoms =6/2=3 Hence, the formula of the compound $ =A{{B}_{3}} $