An alloy of copper and gold crystallizes in cubic lattic, in which the `Au-` atoms occupy the lattice points at the corners of cube and `Cu-` atoms occupy the centre of each face. The formula of this alloy is `:`

Answer

`AuCu_(3)`

Explanation

According to available information :
Number of the gold atoms present at the corners of the unit cell `=1//8xx8=1`
Number of the copper atoms present at the centres of all the six faces of the unit cell
`=1//2xx6=3`
Formula of the allowy `=AuCu_(3)`.