Graphic representation of the periodic table of chemical elements organized in a symmetrical series table with bridge elements. This table was originated by German chemist Victor von Richter (1841-1891) circa 1889 and classified by chemist Edward G. Mazurs as Type IC2-2 in his seminal work Types of Graphic Representation of the Periodic System of Chemical Elements (1957). In this design, the elements of short periods, i.e. the so-called "bridge elements," are placed midway between the subgroups "a" and "b." This illustration appears as Figure 26 on page 107 of Mazurs' 1957 publication.
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Mazurs, Edward G., and Victor von Richter. “Symmetrical Series Table with Bridge Elements.” Glass, circa 1889–1957. Edward G. Mazurs Collection of Periodic Systems Images, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/5q47rp37k.
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