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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 is any positively charged ion.       Salt (NaCl) dissociates into Na+ Cl-with the Sodium (Na+) being â¦ the cation, and Cloride (Cl-) being the anion.       It doesn't have to be a single atom. The conjugate bases of acids tend to be anions, for example the Sulfate ion SO4(2-) Is an anion.