The world's largest scientific society, the ACS is the major professional organization for chemists of all kinds, as well as being a major publisher of scholarly books and journals in the sciences.

A scholarly and professional organization in the UK, as well as a publisher, the RSC is the largest society in Europe dedicated to advancing the chemical sciences.

From the Royal Society of Chemistry, a gorgeous interactive periodic table.

Photographs of all elements in the periodic table!

Use this to help identify bibliographic references and journal abbreviations by searching the publications indexed by Chemical Abstracts Services (CAS).

Via Ohio State University, online flash cards for learning to identify organic chemistry reactions.