Skip to main content
Chemistry LibreTexts

1.2.3: Polyatomic Ions

  • Page ID
    210585
  • \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\)

    Learning Objectives

    • Give the name, formula, and charge of specific polyatomic ions.

    Polyatomic Ions

    As the name implies, a polyatomic ion is a charged molecule. Many polyatomic ions exist, but in CHE 101 we expect that you will learn the name, formula, and charge of these specific ions.

    1+ ammonium ion NH4+1
    1- hydrogen carbonate (bicarbonate) ion HCO3-1
    hydrogen sulfate (bisulfate) ion HSO4-1
    nitrite ion NO2-1
    nitrate ion NO3-1
    cyanide ion CN-1
    hydroxide ion OH-1
    dihydrogen phosphate ion H2PO4-1
    2- carbonate ion CO3-2
    sulfate ion SO4-2
    monohydrogen phosphate ion HPO4-2
    3- phosphate ion PO4-3

    This page titled 1.2.3: Polyatomic Ions is shared under a CC BY license and was authored, remixed, and/or curated by OpenStax.