Here's how to determine the number of atoms in copper sulfate (CuSO4):

* Break down the formula: CuSO4 tells us there's one copper atom (Cu), one sulfur atom (S), and four oxygen atoms (O).

* Total the atoms: 1 + 1 + 4 = 6 atoms

Therefore, there are 6 atoms in one molecule of copper sulfate (CuSO4).