<P> An ion (/ ˈaɪən, - ɒn /) is an atom or molecule that has a non-zero net electrical charge (its total number of electrons is not equal to its total number of protons). A cation is a positively - charged ion, while an anion is negatively charged . Because of their opposite electric charges, cations and anions attract each other and readily form ionic compounds . </P> <P> Ions consisting of only a single atom are termed atomic or monatomic ions, while two or more atoms form molecular ions or polyatomic ions . In the case of physical ionization in a medium, such as a gas, "ion pairs" are created by ion collisions, where each generated pair consists of a free electron and a positive ion . Ions are also created by chemical interactions, such as the dissolution of a salts in liquids, or by other means, such as passing a direct current through a conducting solution, dissolving an anode via ionization . </P>

The charge on an ion is the same as the of that ion
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