[ Teens/Mature Teens ] Offers homework help, math tricks, science news, periodic table, and a discussion forum.

Discussion boards for all areas of chemistry, at levels ranging from high school to graduate school and practicing chemists. Site also includes web directory, periodic table, articles, and reference tables.

Short streaming videos about most every element on the periodic table.

[Very basic data, detailed write-ups] The Chemical Science and Technology division's Periodic Table describes the history, properties, resources, uses, isotopes, forms, costs, and other information for each element.

Available in 6 languages. Provides information on each element, crystallographic data, physical properties, thermal properties, ionization energies, abundance, isotopes and reduction potentials.