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Chloride is a negative ion Cl- . It must be paired with a positive ion to form a complete substance. In the case of sodium chloride that ion is sodium, Na+ . Other chloride salts such as potassium chloride, calcium chloride, and ammonium chloride also exist. As its own element it is called chlorine, which is electrically neutral and takes the form of a toxic green gas, Cl2 .

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8y ago

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