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4. Polyatomic ion - Wikipedia

   en.wikipedia.org/wiki/Polyatomic_ion

   Polyatomic ions often are useful in the context of acid–base chemistry and in the formation of salts. Often, a polyatomic ion can be considered as the conjugate acid or base of a neutral molecule. For example, the conjugate base of sulfuric acid (H 2 SO 4) is the polyatomic hydrogen sulfate anion (HSO − 4).

5. Pentazenium - Wikipedia

   en.wikipedia.org/wiki/Pentazenium

   In chemistry, the pentazenium cation (also known as pentanitrogen) is a positively-charged polyatomic ion with the chemical formula N + 5 and structure N−N−N−N−N.Together with solid nitrogen polymers and the azide anion, it is one of only three poly-nitrogen species obtained in bulk quantities.

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7. List of chemistry mnemonics - Wikipedia

   en.wikipedia.org/wiki/List_of_chemistry_mnemonics

   An atom (or ion) whose oxidation number increases in a redox reaction is said to be oxidized (and is called a reducing agent). It is accomplished by loss of one or more electrons. The atom whose oxidation number decreases gains (receives) one or more electrons and is said to be reduced. This relation can be remembered by the following mnemonics.

8. Oxycation - Wikipedia

   en.wikipedia.org/wiki/Oxycation

   In chemistry, an oxycation is a polyatomic ion with a positive charge that contains oxygen.They usually end with the suffix "-ium" or "-yl". Examples

9. Polyoxometalate - Wikipedia

   en.wikipedia.org/wiki/Polyoxometalate

   The phosphotungstate anion, an example of a polyoxometalate. In chemistry, a polyoxometalate (abbreviated POM) is a polyatomic ion, usually an anion, that consists of three or more transition metal oxyanions linked together by shared oxygen atoms to form closed 3-dimensional frameworks.