Data tables and historic information.

Full text of the monograph by F. F. Dyer (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF]

Basic information, atomic structure, and table of isotopes.

Properties and applications along with photographs and chemical formulas of occurrences.

Basic physical and historical information.

Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).

Image, general and physical information, source, uses, key isotopes, and ionisation energies.

Atomic structure, chemical and physical properties, and table of nuclides.

Extensive information on history, uses, occurrence, compounds, and properties of the element.

Physical data, chemical properties, health and environmental effects.