The American chemist Glenn T. Seaborg—after whom the element seaborgium is named—standing in front of a periodic table, May 19, 1950
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Periodic table
Periodic table forms
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32-column
Alternativeandextendedforms
Periodic table history
D. Mendeleev
1871 table
1869 predictions
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8+
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The periodic table is an arrangement of the chemical elements, structured by their atomic number, electron configuration and recurring chemical properties. In the basic form, elements are presented in order of increasing atomic number, in the reading sequence. Then, rows and columns are created by starting new rows and inserting blank cells, so that rows (periods) and columns (groups) show elements with recurring properties (called periodicity). For example, all elements in group (column) 18 are noble gases that are largely—though not completely—unreactive.
The history of the periodic table reflects over two centuries of growth in the understanding of the chemical and physical properties of the elements, with major contributions made by Antoine-Laurent de Lavoisier, Johann Wolfgang Döbereiner, John Newlands, Julius Lothar Meyer, Dmitri Mendeleev, Glenn T. Seaborg, and others.[1][2]
^IUPAC article on periodic table Archived 2008-02-13 at the Wayback Machine
^Cite error: The named reference NYT-20190827 was invoked but never defined (see the help page).
and 22 Related for: History of the periodic table information
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