Basic information, atomic structure, and isotopes.

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

Data tables and historic information.

Basic physical and historical information.

History, sources, properties, and uses.

Physical data, chemical properties, and health effects.

Full text of the monograph by Duane Neuman Sunderman (Battelle Memorial Institute, Columbus, Ohio) and Charles William Townley (Battelle Memorial Institute, Columbus, Ohio). [PDF]

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

Image, appearance, uses, physical information, and ionisation energies.

Extensive information on history, uses, occurrence, compounds, and properties.

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