Graphic representation of the periodic table of chemical elements as a symmetrical series table with centered steps. This table was originated by English chemist Thomas Carnelley (1854-1890) in 1886 and classified by chemist Edward G. Mazurs as Type IIC2-7 in his seminal work Types of Graphic Representation of the Periodic System of Chemical Elements (1957). A version of this table appears as Figure 59 on page 129 of Mazurs' 1957 publication.
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Mazurs, Edward G., and Thomas Carnelley. “Symmetrical Series Table with Centered Steps.” Glass, circa 1886–1957. Edward G. Mazurs Collection of Periodic Systems Images, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/nc580n11g.
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