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Atom or group of atoms carrying a negative electric charge, indicated by a superscript minus sign after the chemical symbol. Anions in a liquid subjected to an electric field migrate toward the positive electrode (anode). Examples include hydroxyl (OH; seehydroxide), carbonate (CO2), and phosphate (PO3). See alsoion; comparecation.
This entry comes from Encyclopædia Britannica Concise. For the full entry on anion, visit Britannica.com.