Table of Common Polyatomic Ions


Tables of Common Polyatomic Ions


List of Tables:

  • Table 1: Cations (+1 Charge)
  • Table 2: Anions (-1 Charge)
  • Table 3: Anions (-2 Charge)
  • Table 4: Anions (-3 Charge)

The tables below list common polyatomic ions that you will be using
throughout this General-Chemistry laboratory series (Chem 151-152). These ions are
separated by charge on the ion into four (4) different tables and listed alphabetically
within each table. For each polyatomic ion, the name, chemical formula, two-dimensional
drawing, and three-dimensional representation are given.

The three-dimensional structures are drawn as CPK models. CPK structures
represent the atoms as spheres, where the radius of the sphere is equal to the van der
Waals radius of the atom; these structures give an approximate volume of the polyatomic
ion. In these tables, the three-dimensional structures have all been drawn to the same
scale; therefore you can compare their relative sizes. In addition, the atoms in the CPK
structures have been color-coded to match the two-dimensional drawings for easier
comparison.

To view the ions interactively, please use RASMOL ,
a computer application which is available for both Macs and PCs and can be downloaded at
the RASMOL site. To download the pdb files (refers to the protein databank method of
saving atomic coordinates for a molecule) for viewing and rotating the ions listed in the
tables below, please click on the appropriate three-dimensional structure. (Note: If you
want to view multiple compounds simultaneously, please download each pdb file and save on
your computer. Then open RASMOL outside of Netscape.) NOTE: CPK sizes for metal
atoms Cr and Mn will be incorrect in RASMOL.


Table 1: Cations (+1 Charge)

Ion

Two-Dimensional Structure

Three-Dimensional Representation

Ammonium NH4+

Hydronium H3O+

Index

Table 2: Anions (-1 Charge)

Ion

Two-Dimensional Structure

Three-Dimensional Representation

Bicarbonate HCO3

Cyanide CN

Hydrogen Sulfate HSO4

Hydroxide OH

Nitrate NO3

Nitrite NO2

Perchlorate ClO4

Permanganate MnO4

Index

Table 3: Anions (-2 Charge)

Ion

Two-Dimensional Structure

Three-Dimensional Representation

Carbonate CO32

Chromate CrO42

Dichromate Cr2O72

Hydrogen Phosphate HPO42

Sulfate SO42

Sulfite SO32

Thiosulfate S2O32

Index

Table 4: Anions (-3 Charge)

Ion

Two-Dimensional Structure

Three-Dimensional Representation

Phosphate PO43

Index



Selected by the sciLINKS program, a
service of the National Science Teachers
Association. Copyright 2001.

Copyright 1998, Washington University, All Rights Reserved.