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Any of the elements appearing in Group 6a of the periodic table, sharing certain chemical properties; oxygen, sulfur, selenium, tellurium, polonium, or element 116.

[Greek khalkos, copper + -gen, since many of the important ores of copper, such as chalcopyrite, contain chalcogens.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Elements & Compounds) any of the elements oxygen, sulphur, selenium, tellurium, or polonium, of group 6A of the periodic table
[C20: from chalco(pyrite) + -gen]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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To lower the bandgap of these ABO3 materials, substitution of oxygen with chalcogens such as sulfur or selenium has been recently explored.
The semiconducting [V.sub.2][VI.sub.3] compounds ([Sb.sub.2][S.sub.3] and [Sb.sub.2][Se.sub.3]) are highly anisotropic semiconductors with a layered structure parallel to the growth direction with orthorhombic phase crystal structure, which is known to adopt a number of packing structures resulting in either trigonal prismatic or octahedral coordination of the metals within a layered matrix of chalcogens [1].
Chalcogens (Ch) (group of 16 elements) form one of the interesting groups of elements on the periodic table.
Jacob, Novel Peptidomimetic Compounds Containing Redox Active Chalcogens and Quinones as Potential Anticancer Agents, Eur.
Vargas-Baca's own interest was with other heavy elements, specifically those in Group 16 of the periodic table known as the chalcogens. His work revealed examples of cyclic molecules that formed automatically when single tellurium-oxygen chalcogen bonds took the place of hydrogen bonds, a process unlike anything seen in halogen bonding.
Tellurium (Te) is an element sharing the same group of sulfur and selenium in the periodic table; that is, it is the heaviest of the stable chalcogens (group 16) and is classified as a metalloid.
Wahnon, "Formation of a reliable intermediate band in Si heavily coimplanted with chalcogens (S, Se, Te) and group III elements (B, Al)," Physical Review B, vol.
(1993) Reaction chemistry of a tungsten disilene complex: net one atom insertion of chalcogens into [Cp.sub.2]W([[eta].sup.2]-[Me.sub.2]Si:Si[Me.sub.2]).
The chalcogens, elements of Groups 5B and 6B of the Periodic Table that form or have a close association with metallic ore minerals yield not only chalcogen-bearing secondary minerals, amorphous compounds and soluble anion complexes when their primary host minerals break down, but also chalcogen gases.