Chemical Engineering

Search chemical structures and drawings. Note: does not accept common names.

From the National Institutes of Health. Find the chemical structures of small organic molecules and information on biological activities.

Information about chemical elements and compounds (structures, properties), compare elements and compounds, compute properties of chemicals and solutions.

Up-to-date interactive table, providing lots of additional information, including background information, compounds, electronic properties, physical properties, crystallography (with visualization options), nuclear properties. Download printable versions.

The Royal Society of Chemistry offers a stream-lined, interactive version of the periodic table.