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Anion Definition: An ionic species having a negative charge. Anion Examples: free chloride in an aqueous table salt (NaCl) solution, singlet oxygen. Table of Common Anions. Return to the Chemistry Glossary Index. By Anne Marie Helmenstine, Ph.D.
A cation (+) (/ Ë k Ã¦ t. aÉª. Én /), from the Greek word ÎºÎ¬ÏÏ (kÃ¡to), meaning down, is an ion with fewer electrons than protons, giving it a positive charge. There are additional names used for ions with multiple charges. For example, an ion with a â2 charge is known as a dianion and an ion with a +2 charge is known as a dication.