We need to break down the following ionic compounds into ions:
Recall that an ionic compound is composed of a positive ion called a cation connected to a negative ion called an anion.
In writing their chemical formula, the charge of the cation becomes the subscript of the anion, while the charge of the anion becomes the subscript of the cation
It is also helpful to remember the common charges of common cations/anions:
What ions are present in NaCl, Na 2CO3, MgSO4, and NH4Cl?