noun🔗ShareIonAn atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution."When salt dissolves in water, it breaks down into sodium ions and chloride ions. "Lorsque le sel se dissout dans l'eau, il se décompose en ions sodium et en ions chlorure.chemistryphysicselementChat with AIVocabulary GamePractice Reading