. A compound formed by elements X and Y crystallizes


crystallizes in a cubic structure in which the X atoms are at the corners of a cube and the Y atoms are at the face - centres. The formula of the compound is:

A: X3Y

B: XY

C: XY2

D: XY3

 

Best Answer

Explanation:

As per the question, the X atoms are at the corners of a cube and the y atoms are at the face - centres.

On one corner of a cube, only one atom can accommodate so the number of x atoms per unit cell will be

8/8=1

On one face of a cube, two atoms can accommodate so the number of y atoms per unit cell will be

6/2=3

So, the compound formula is .xy3

Final answer:

Hence, the correct option is D, i.e. .xy3

 

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