A substance A_(x) B_(y) crystallises in a face centred cubic (FCC) lattice in which atoms 'A' occupy each corner of the cube and atoms 'B' occupy the centres of each face of the cube. Identify the correct composition of the substance A_(x)B_(y).

A substance A_(x) B_(y) crystallises in a face centred cubic (FCC) lat

1.	A substance A_(x) B_(y) crystallises in a face centred cubic (FCC) lattice in which atoms 'A' occupy each corner of the cube and atoms 'B' occupy the centres of each face of the cube. Identify the correct composition of the substance A_(x)B_(y).
Answer» `AB_(3)` `A_(4)B_(4)` `A_(3)B` COMPOSITION cannotbe specified. Solution :Number of A atoms per UNIT CELL =`8times1/8=1` Number of B atoms per unit cell = `6times1/2=3` Composition of solid = `AB_(3)`