Question
Chemistry Question on Structure of atom
An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be:
A
(A) AB
B
(B) A2B
C
(C) AB3
D
(D) A3B
Answer
(C) AB3
Explanation
Solution
Explanation:
Since A is present at the 8 corners, number of A ions per unit cell =18×8=1Since B is present at the centre of 6 faces, number of B per unit cell =12×6=3∴ The ratio of A and B is 1:3, so the formula of the compound is AB3.Hence, the correct option is (C).