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What are polyatomic ions? Give examples.
The ions which contain more than one atom (same kind or may be of a different kind) and behave as a single unit are called polyatomic ions e.g., OH–, SO42-, CO32-.
[Extra information: Ions are atoms or molecules which have gained or lost one or more valence electrons, giving the ion a net positive or negative charge.
Cations are positively charged ions. They are formed when a metal loses its electrons. They lose one or more than one electron and do not lose any protons. Therefore they possess a net positive charge. Some examples of cations are Calcium (Ca2+), Potassium (K+), hydrogen (H+).
Anions are negatively charged ions. They are formed when a nonmetal gains electrons. They gain one or more than one electron. Therefore they possess a net negative charge. Some examples of anions are Chloride ions (Cl-), iodide(I-), Bromide ions (Br-).]
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