Here's how to determine the number of atoms in NH₄Cl (ammonium chloride):

1. Identify the elements and their subscripts:

* N: Nitrogen (1 atom)

* H: Hydrogen (4 atoms, indicated by the subscript 4)

* Cl: Chlorine (1 atom)

2. Add the number of atoms of each element:

1 (N) + 4 (H) + 1 (Cl) = 6 atoms

Therefore, there are 6 atoms in one molecule of NH₄Cl.