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nature : charged atom or atoms. Positively charged ions are said Ion (positive ion) or cationic. Negatively charged ions said anion (negative ion) or anion. When more active elements of the metal atoms, such as sodium atoms Na and more active elements of the non-metallic atoms such as chlorine atoms near each other Cl, Na lost an electronic form first is a charge of sodium ions Na +, Cl result in an electronic form with a negative charge of chlorine ion Cl-. Ion existed in many compounds and solutions, such as ionic compounds and electrolyte solution. Ion nature and atoms or molecules are totally different in nature. For example, sodium atoms of sodium metal was silver-white, water-intense reaction to the generation of sodium hydroxide and hydrogen, sodium ion has no color, but with the water not react.
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