A substance `A_(x)B_(y)` crystallises in a face centered cubic lattice. Atoms 'A' occupy each corner of unit cell and atoms of B occupy centre of each face of the cube. Total number of atoms of A and B in the unit cell is __________

Answer

4

Explanation

For FCC?CCP, Z = 4

no. of atoms in FCC, A-corners `=8 xx 1/8 =1, A_(1) `, B-Face centre `6 xx 1/2 =3, B_(3), A_(1)B_(3)` total no. of atoms = 4.