Electronic, thermal, and steric data along with basic information.

Basic information, atomic structure, and table of isotopes.

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

Basic physical and historical information.

Sources, properties, uses, and compounds.

Physical data, chemical properties, health and environmental effects.

Full text of the monograph by W. T. Mullins and G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF]

Data tables and historic information.

Image, animation, source, uses, key isotopes, and ionisation energies.

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

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