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

* Break down the formula:

- Cu: Copper

- S: Sulfur

- O₄: Four Oxygen atoms

* Count the atoms:

- 1 Copper atom (Cu)

- 1 Sulfur atom (S)

- 4 Oxygen atoms (O)

* Total: 1 + 1 + 4 = 6 atoms

Therefore, there are 6 atoms in one molecule of CuSO₄.