Why we say CuZnSnS but we cannot say ZnCuSnS and CuGaS but not GaCuS ?

 I have a question about the Chemical formula (Composition or pattern phases). Why we say CuZnSnS but we cannot say ZnCuSnS, CuGaS but not GaCuS and PbSnS not SnPbS. It depends on periodic table...

08 August 2017 9,034 1 View