Basic information, atomic structure, and isotopes.

Article by Clemens Winkler.

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

Data tables and historic information.

Basic physical and historical information.

History, sources, uses, and properties.

Physical data, chemical properties, health and environmental effects.

Full text of the monograph by Jacob A. Marinsky (University of Buffalo, Dept. of Chemistry, Buffalo, New York). [PDF]

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

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

Properties of the element, including its history, applications, and characteristics.