Searchable database of material properties.

Provides thermochemical, thermophysical, and ion energetics data compiled by NIST under the Standard Reference Data Program.
National Institute of Standards and Technology.

Free structure and properties database from the Royal Society of Cheimstry.

Free chemistry database from the National Library of Medicine, searchable by structure or name. Contains properties data, links to spectra and literature, uses, and more.

This resource is powered by the Protein Data Bank archive-information about the 3D shapes of proteins, nucleic acids, and complex assemblies that helps students and researchers understand all aspects of biomedicine and agriculture, from protein synthesis to health and disease.

CAS Common Chemistry is an open community resource for accessing chemical information. Nearly 500,000 chemical substances from CAS REGISTRY® cover areas of community interest, including common and frequently regulated chemicals, and those relevant to high school and undergraduate chemistry classes. This chemical information, curated by our expert scientists, is provided in alignment with our mission as a division of the American Chemical Society.

Provides free access to chemical property and synthesis information for over 40,000 compounds.

A lesson about every single element on the periodic table

Health and safety information submitted to EPA under the Toxic Substances Control Act.