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They are electrically charged species composed of more than one atom

Examples:

  1. Monoatomic: Cl- chloride , S2- sulfide, Na+ sodium
  2. Polyatomic: NH4+ ammonium, CO32- carbonate

Edit:

It is a tightly bound group of atoms that has a positive or negative charge and behaves as a unit.

Source: My Chemistry textbook. (Prentice Hall)

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7y ago

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