Relevant details on the element’s structure presented including information on its energy levels.

Articles providing insights to the element’s composition and various properties.

Historical summary of its uses presented including information on its grouping scheme and classifications.

Mentions the element’s source and industrial uses. Presents electronic configuration and atomic data.

Statistical data contained in the archive of annual publication and reference materials. Includes subscription information.

Classifies its physical form, chemical composition and grouping schemes. Also provides data on atomic structure.