General and physical information, key isotopes, and ionisation energies.

Statistics and information on the worldwide supply, demand, and flow of the element. [PDF]

Basic physical and historical information.

Basic information, atomic structure, and isotopes.

Data tables and historic information.

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.

Article by P.E. Lecoq de Boisbaudran.

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