Chemistry editor

Atto ::: atto_chemistry
Maintained by Geoffrey Rowland
Edit chemistry equations in Moodle 2.7, or later, using the mhchem extension to the MathJax or TeX filter. Useful for full and ionic equations, isotopes, equilibrium reactions, thermochemistry and reaction kinetics. Includes a periodic table of element symbols.

Chemistry editor v2.9-2

Moodle 2.7, 2.8, 2.9, 3.0, 3.1
Released: Wednesday, September 30, 2015, 3:00 AM


Chemistry equation editor for Moodle using the mhchem extension in MathJax/TeX



Download the zip file, unzip to give the moodle-atto_editor-chemistry folder. Rename this to chemistry and copy to the lib/editor/atto/plugins folder of your Moodle installation to give lib/editor/atto/plugins/chemistry

Or Navigate to the lib/editor/atto/Plugins directory of your Moodle installation. Then isue the command

git clone chemistry.

Then visit the Admin notifications page of your Moodle to complete the installation.

After installation you need to complete the following steps:

Add chemistry to Administration > Site administration > Plugins > Text editors > Atto HTML editor > Atto toolbar settings > Toolbar config, to give, for example:

insert = chemistry, equation, charmap, table, clear

Add mhchem to the Moodle MathJax filter configuration

Edit Administration > Site administration > Plugins > Filters > MathJax > MathJax configuration to include:

TeX: { extensions: ["AMSmath.js","AMSsymbols.js","color.js","mhchem.js","noErrors.js","noUndefined.js"] },

You may need to Purge all caches on your Moodle server

Administration > Site administration > Development > Purge all caches

and in your browser


Version information

Version build number
Version release name
Stable version
MD5 Sum
Supported software
Moodle 2.7, Moodle 2.8, Moodle 2.9, Moodle 3.0, Moodle 3.1
  • Latest release for Moodle 2.7
  • Latest release for Moodle 2.8
  • Latest release for Moodle 2.9
  • Latest release for Moodle 3.0
  • Latest release for Moodle 3.1

Version control information

Version control system (VCS)
VCS repository URL
VCS branch

Default installation instructions for plugins of the type Atto

  1. Make sure you have all the required versions.
  2. Download and unpack the module.
  3. Place the folder (eg "myeditorplugin") in the "lib/editor/atto/plugins" subdirectory.
  4. Visit to finish installation of the plugin.

To make the newly installed plugin available, you need to edit the Atto toolbar configuration so that the new plugin appears in the toolbar.

  1. Go to your Site administration ►Plugins ► Text editors ► Atto HTML editor ► Atto toolbar settings
  2. Add the new plugin to the desired position in the toolbar.