CHEM1004: Descriptive Chemistry (Cameron University)
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A text is for a one-semester introductory course in chemistry. Principal concepts and theories of chemistry are examined from the layman's point of view.
Thumbnail: Theodor Benfey's arrangement is an example of a continuous (spiral) table. First published in 1964, it explicitly showed the location of lanthanides and actinides. The elements form a two-dimensional spiral, starting from hydrogen, and folding their way around two peninsulas, the transition metals, and lanthanides and actinides. (CC BY-SA 3.0 Unported; Obsuser via Wikipedia)