Here's how to determine the total number of atoms in CaF₂:

* Chemical Formula: CaF₂ represents one molecule of calcium fluoride.

* Subscripts: The subscripts in the formula tell us the number of each type of atom:

* Ca: 1 calcium atom

* F₂: 2 fluorine atoms

* Total Atoms: 1 (Ca) + 2 (F) = 3 atoms

Therefore, there are a total of 3 atoms in one molecule of CaF₂.