Basic information, atomic structure, and isotopes.

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

Basic physical and historical information.

History, sources, properties, uses, and isotopes.

Physical data, chemical properties, health and environmental effects.

Overview for the general reader.

Image, animation, uses, physical information, 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.

Data tables and historic information.