The smallest particle of an element - atom, an atom or molecule that has lost or gained an electron, giving it charge - ion, A positive ion formed when a hydrogen ion loses its one electron, with the symbol H+ - hydrogen ion, A negative ion made up of an oxygen atom bonded to a hydrogen atom, with the symbol OH- - hydroxide ion, A substance that releases H+ ions in a solution - acid, A substance that releases OH- ions in solution - base,

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