Science

Basic physical and historical information.

Basic information, atomic structure, and isotopes.

Overview and a number of publications in PDF format.

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

Physical data, chemical properties, health and environmental effects.

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

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

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