Canadian Database of Geochemical Surveys

Periodic Table Index Help Topics


The periodic table is presented in the standard format, with 18 columns and seven rows.  The lanthanide and actinide groups are displayed as separate rows below the seven main rows.

Each table cell has a background colour of either red or blue.  Elements in the red cells have raw data available in the standardised CDoGS format.  They are hyperlinked to KML index maps showing the surveys that have data for that element.  For example, assuming that Google Earth™ is installed on your computer, clicking on "Na" will produce a map showing all of the surveys across Canada, for which Na was analysed and the raw data have been made available via this website.  Within Google Earth™, clicking on any of the yellow stars displays a pop-up box with more information about the geochemical maps available for the element chosen from the periodic table.  The pop-up box is described in detail here.

Note that less than 10% of the surveys in the catalogue have data that have been reformatted into the standardised format.  There is no easy way to determine exactly what elements were analysed in the other surveys.  The number of surveys that are available in the standardised format is slowly increasing.

Additional help on utilising the KML maps is available on a separate page.  Details about the standardised CDoGS format are also available.


The periodic table as presented in the standard format is difficult to navigate without using a mouse.  Therefore, the information is also available as a simple table entitled "List of Elements" found beneath the periodic table.  Keyboard users can skip to the "List of Elements" simple table by tabbing to the green "Element List" button and pressing Enter.

List of Elements

General help for filtering and sorting the table can be found on a separate page.

The following information is available for each element in the List of Elements table, in the order the columns are arranged:

At. No.

The Atomic Number, which uniquely identifies each element, is given.


The standard 1-, 2- or 3-letter code for each chemical element is given.


The full name of the chemical element is provided.

At. Wt.

The Atomic Weight for each element is given.

Index Map

Some elements have raw data available in the standardised CDoGS format and this is indicated by an icon in this column.  The icon is a hyperlink to a KML index map showing all of the surveys across Canada that currently have data compiled into a standardised format for that element.  For information on the features found on the index map, please refer to the help topic Index Maps of Analysed Elements.

For example, if Google Earth™ is installed, clicking on the icon for "Ba" will display an index map showing all of the barium surveys currently catalogued that have raw data for barium available as MS-Excel® spreadsheets or a KML Ba distribution map.  Within Google Earth™, you can then click on any of the yellow stars to get additional information about the analyses.  See the help topic Index Maps of Analysed Elements for further details.  For details on how to access the analytical information, spreadsheets of raw data or the KML geochemical element distribution maps, see the Analytical History section of the Help topic Extended Metadata Subsections.