Here's how to determine the number of atoms in ammonium hydroxide (NH₄OH):

* Identify the elements: Ammonium hydroxide contains nitrogen (N), hydrogen (H), and oxygen (O).

* Count the atoms of each element:

* Nitrogen (N): 1 atom

* Hydrogen (H): 5 atoms (4 from ammonium, 1 from hydroxide)

* Oxygen (O): 1 atom

* Total atoms: 1 + 5 + 1 = 7 atoms

Therefore, there are 7 atoms in a molecule of ammonium hydroxide.