Partial graphic representation of the periodic table of chemical elements designed as a left-step series table with the symbols of the elements arranged according to their valences. The section displayed here depicts the transitional and rare earth elements. This type of table was originated by chemist Edward G. Mazurs in 1955 and classified by Mazurs as Subtype IIIC3-4a in his seminal work Types of Graphic Representation of the Periodic System of Chemical Elements (1957). A full version of this table appears as Figure 77 on page 143 of Mazurs' 1957 publication.
Mazurs, Edward G. “Partial Left-Step Series Table Designed by Edward G. Mazurs.” Glass (material), circa 1955–1957. Edward G. Mazurs Collection of Periodic Systems Images, Box 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/r494vk86x.
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