Data tables and historic information.

Basic information, atomic structure, and isotopes.

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

Basic physical and historical information.

History, properties, and uses.

Physical data, chemical properties, health and environmental effects.

Thermal properties, ionisation energies, and reduction potentials.

Full text of the monograph by J. G. Cuninghame (Atomic Energy Research Establishment, Harwell, Didcot, Berkshire, England). [PDF]

Overview and a number of publications in PDF format.

Source, biological role, physical information, and key isotopes.

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

Details the properties of the element, including its history, applications, and characteristics.