Here's how to determine the number of atoms in copper carbonate (CuCO₃):

* Identify the elements: Copper carbonate is composed of copper (Cu), carbon (C), and oxygen (O).

* Determine the subscripts: The chemical formula CuCO₃ indicates:

* 1 copper atom (Cu)

* 1 carbon atom (C)

* 3 oxygen atoms (O)

* Calculate the total: 1 + 1 + 3 = 5 atoms

Therefore, there are 5 atoms in one molecule of copper carbonate (CuCO₃).