A compound alloy of gold and copper crystallizes in a cube lattice in which the gold atoms occupy the lattice points at the corners of a cube and the copper atoms occupy the centres of each of the cube faces. The formula of this compound is-
(D) None of these
(C). One-eight of each corner atom (Au) and one-half of each face-centred atom (Cu) are contained with in the unit cell of the compound.
Thus, the number of Au atoms per unit cell = . The formula of the compound is .