What is the term for a single atom that has a negative or a positive charge as the result of gaining or losing valence electrons?

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A single atom that has a negative or a positive charge as the result of gaining or losing valence electrons is called a monoatomic ion. An anion is a negatively charged ion formed when an atom gains one or more electrons. A cation is a positively charged ion formed when an atom loses one or more electrons. However, both anions and cations can be composed of multiple atoms and are therefore classified as polyatomic ions.

What Is the Term for a Single Atom That Has