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- An anionA negatively charged ion. An ion that is attracted toward the anode in an electrolytic cell. containing oxygen and another elementA substance containing only one kind of atom and that therefore cannot be broken down into component substances by chemical means.. Also called oxoanionAn anion containing oxygen and another element. Also called oxyanion. Examples are nitrate, sulfate, and phosphate ions.. Examples are nitrate, sulfate, and phosphate ions.