Here's how to determine the number of atoms in a calcium carbonate molecule:

* Chemical Formula: Calcium carbonate has the chemical formula CaCO₃.

* Elements: This formula tells us that each molecule of calcium carbonate contains:

* 1 calcium atom (Ca)

* 1 carbon atom (C)

* 3 oxygen atoms (O)

* Total Atoms: 1 + 1 + 3 = 5 atoms

Therefore, there are 5 atoms in a molecule of calcium carbonate.