Of any substance? What about two powders such as 1/2 cup of white flour, then mixing 1/2 cup of salt together with the flour. This would then form a more coarse mixture being that the two particles differ in shape.
Answer:
Such a waste of points but lol
Bromine (Br) is the only element listed that is a diatomic element. I believe that Bromine is going to be your answer.
The ionic formula of sodium oxide would be Na20
