Question

A compound formed by elements x and y crystallises in a cubic structure where y atoms r at corners of cube and x at alternate faces. Faceswhat is the formula of compound?

Answer 1

In the given compound; there must be 8 corners in a cube,

So, as the Y atoms are at corners, so each of the Y atom will contribute 1/8 part towards a particular unit cell.

The no. of Y atoms per unit cell = 8 x 1/8 = 1

Further, the X atoms are at the alternate faces so they will be available only at one of the opposite faces, so the contribution of each of the X-atoms will be 1/2 towards the face center.

The no. of X-atoms = 2 x 1/2 = 1

Hence, the formula of the compound will be "XY" and the compound will be represented as;

Answer 2

Answer:

XY

Explanation:

y = 8• 1/8

=1

x = 2•1/2 = 1

x:y = 1:1

so formula is XY