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The periodic table is a tabular arrangement of the chemical elements, organized by their atomic number, electron configuration, and chemical properties. It is a useful tool for understanding the patterns and trends of the elements and their interactions. Learn more about the history, structure, and significance of the periodic table on Wikipedia.
1971 — Clark, John O. E. periodic table [119] 2005 — Rich's periodic chart exposing diagonal relationships: Non-metals of the left; metals on the right [120] 2018 — Beylkin's periodic table of the elements:4n 2 periods, where n = 2,3..., and shows symmetry, regularity, and elegance, more so than Janet's left step table [121]
List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z ). [ 1]
A block of the periodic table is a set of elements unified by the atomic orbitals their valence electrons or vacancies lie in. [ 1] The term seems to have been first used by Charles Janet. [ 2] Each block is named after its characteristic orbital: s-block, p-block, d-block, f-block and g-block . The block names (s, p, d, and f) are derived from ...
An extended periodic table theorizes about chemical elements beyond those currently known and proven. The element with the highest atomic number known is oganesson ( Z = 118), which completes the seventh period (row) in the periodic table. All elements in the eighth period and beyond thus remain purely hypothetical.
Ray-Ban is a brand of luxury sunglasses and eyeglasses created in 1936 by Bausch & Lomb. The brand is best known for its Wayfarer and Aviator lines of sunglasses. In 1999, Bausch & Lomb sold the brand to Italian eyewear conglomerate Luxottica Group for a reported $640 million.
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