what is an ion give examples
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An ion is a positively or negatively charged atom.
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If an ion consists of a single atom, it is called a monatomic ion. An example is the hydrogen ion, H+. By contrast, polyatomic ions, also called molecular ions, consist of two or more atoms. An example of a polyatomic ion is the dichromate anion: Cr2O72-Sep 4, 2019
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