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jacob193

Answer:

An ion is polyatomic if it contains more than one atoms.

Explanation:

The prefix "poly-" in the word polyatomic means "more than one." A polyatomic ion contains more than one atoms. Note that these atoms might belong to the same element. For example, in the book Foundations of Introductory College Chemistry, the triiodide ion [tex]\rm {I_3}^{-}[/tex] (note the subscript) is also classified as "polyatomic."

Other (more common) examples include:

  • the sulfate ion, [tex]\rm {SO_4}^{2-}[/tex], which contains five atoms, and
  • the hydroxide ion, [tex]\rm OH^{-}[/tex], which contains two atoms.

In contrast, an ion is monatomic (with the prefix "mono-") if it contains only one atom. Examples include:

  • the chloride ion, [tex]\rm Cl^{-}[/tex],
  • the iodide ion, [tex]\rm I^{-}[/tex] (without the subscript,) and
  • the sodium ion, [tex]\rm Na^{+}[/tex]

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