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Polyatomic ions

Simple ions are formed from the loss or gain of electrons from single atoms.

An ion that contains more than one element is called a polyatomic ion.

  • ammonium ion - NH4+
  • hydroxide ion - OH-
  • nitrate ion - NO3-
  • sulfate ion - SO42-
  • carbonate ion - CO32-
  • phosphate ion - PO43-
  • dichromate (VI) ion - Cr2O72-
  • manganate (VII) ion - MnO4-

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Specification: OCR Chemistry A (H032), AS-level, 2.1.2 Compounds, formulae and equations. Topic: Atoms, Ions and Compounds.

Key terms in this lesson

Ion
A positively or negatively charged atom or group of atoms, formed by the loss or gain of electrons.

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