Final answer:
Polyatomic ions are ions composed of more than one element, and their names are not changed when used in naming compounds; hence, the answer is c) Polyatomic.
Step-by-step explanation:
Ions made up of more than one element are called polyatomic ions, and the ending is NOT changed when naming the compound. Therefore, the correct answer to your question is c) Polyatomic. These ions can be thought of as electrically charged molecules, meaning they are a group of bonded atoms with an overall electric charge. For example, the nitrate ion, which is represented as NO3⁻, is a common polyatomic ion composed of one nitrogen atom and three oxygen atoms, carrying an overall charge of -1.
Polyatomic ions have characteristic formulas, names, and charges that are often memorized because of their frequent use in chemistry. The majority of polyatomic ions are anions and typically end with the suffix -ate or -ite. It is important to remember that when naming compounds containing polyatomic ions, the name of the anion is used as is, without changing it to an -ide ending, unlike the naming procedure used for monatomic ions.