1.

A crystal is formed by two elements X and Y in cubic structure. X atoms are at the corners of a cube while Y atoms are at the face centre . The formula of the compound will be

Answer»

XY
`XY_2`
`X_2Y_3`
`XY_3`

SOLUTION :No. of X atom (at the CORNERS) = `1/8` x 8 =1
No. of Y ATOMS (fcc) = `6xx1/2`=3
HENCE, the formula is `XY_3`


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