Detailed overview and data.

Basic information, atomic structure, and table of isotopes.

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

Preparation, manufacture, reactions, and uses.

Data tables and historic information.

Basic physical and historical information.

History, properties, uses, and handling.

Physical data, chemical properties, health and environmental effects.

General and physical information, 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.