Final answer:
When naming ionic compounds, the name of the cation (metal) is written first, followed by the name of the anion (nonmetal) with its ending changed to -ide.
Step-by-step explanation:
When naming ionic compounds, the name of the cation (metal) is written first, followed by the name of the anion (nonmetal) with its ending changed to -ide.
For example, K₂O is called potassium oxide and NaCl is called sodium chloride.
The correct answer is c) -ide.