What does an ion contain?
All inorganic salts are composed of a metal ion (or an ammonium ion) and an acid radical ion. Table salt for example is composed of a sodium ion and a chlorine ion (the radical ion of hydrochloric acid). Organic salts (called esters) may or may not contain a metal ion. Organic salts that do not contain a metal ion, its role is taken by an alkaloid radical ion.