Here's how to determine the number of atoms in ammonium nitrate (NH₄NO₃):

* NH₄: This represents the ammonium ion. It contains:

* 1 nitrogen atom (N)

* 4 hydrogen atoms (H)

* NO₃: This represents the nitrate ion. It contains:

* 1 nitrogen atom (N)

* 3 oxygen atoms (O)

Total Atoms:

* Nitrogen (N): 1 + 1 = 2

* Hydrogen (H): 4

* Oxygen (O): 3

Therefore, there are a total of 9 atoms represented in the formula for ammonium nitrate (NH₄NO₃).