Graphic representation of the periodic table of chemical elements depicted as a spiral with eight radii. This table was originated by O.I. Stewart in 1928 and classified by chemist Edward G. Mazurs as Type IB2-2 in his seminal work Types of Graphic Representation of the Periodic System of Chemical Elements (1957). In this design, the elements of short periods are placed on the radii and the subgroups of the medium periods "a" and "b" are distinguished by writing the symbols of elements on both sides of the radii. This illustration appears as Figure 25 on page 106 of Mazurs' 1957 publication.
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Mazurs, Edward G., and O.I. Stewart. “Periodic Table in Style of Spiral with Radii (O.I. Stewart, 1928).” Glass, circa 1928–1957. Edward G. Mazurs Collection of Periodic Systems Images, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/5425kb31b.
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