Definition: A molecule, atom or species having a positive or negative charge is called an ion. Types of Ions. Ions are two types a) Positive Ions or Cations b) Negative Ions or Anions a) Positive Ion or Cation: A species which has a positive charge is called positive ion Cation. When atoms lose one or more electrons, positive ions are formed. A sufficient amount of energy is supplied to a neutral atom, then the atom loses an electron to form a positive ion. For this reason, the formation of a positive ion is an endothermic process. A + Energy ---------------------> A + 1e = +ve Cations may have +1, +2, +3, +4 charge...
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