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Topic: Chalcogens

Related Topics

Group 16 element

Chemical series

Periodic table series

Gold chalcogenides

Period 1 element

Periodic table

Periodic table group

Period 4 element

Pnictogen

Period 3 element

Period 2 element

Tellurium

Period 5 element

Period 7 element

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	CONK! Encyclopedia: Chalcogens (Site not responding. Last check: 2007-11-05)
		The chalcogens (with the "ch" pronounced with a hard "c" as in "chemistry") are the name for the periodic table group 16 (old-style: VIB or VIA) in the periodic table.
		The compounds of the heavier chalcogens (particularly the sulfides, selenides, and tellurides) are collectively known as chalcogenides.
		Unless grouped with a heavier chalcogen, oxides are not considered chalcogenides.
	www.conk.com /search/encyclopedia.cgi?q=Chalcogens (320 words)

	chalcogens (Site not responding. Last check: 2007-11-05)
		The chalcogens are the name for the periodic table group 16 (old-style: VIB or VIA) in the Periodic Table.
		A term like 'chalcides' might have been a more logical derivative from chalcogen, like halide is from halogen, but the scientific language is, like any language, not always logical.
		The oxidation number of the chalcogen is generally -2 in a chalcogenide but other values (e.g.
	www.yourencyclopedia.net /Chalcogens.html (236 words)

	Chalcogen : Chalcogens
		The chalcogens are the name for the chemical series Group 16 (old-style: VIB or VIA) in the Periodic Table.
		A term like 'chalcides' might have been a more logical derivative from chalcogen, like halide is from halogen, but the scientific language is -like any language- not always logical.
		The name is generally considered to mean "ore former" from the Old Greek chalcos "ore" and -gen "formation".
	www.fastload.org /ch/Chalcogens.html (225 words)

	Chalcogens Terms and Definitions at www.MedicalGlossary.org
		A radioactive element that is a member of the chalcogen family.
		Sulfur - An element that is a member of the chalcogen family.
		An element that is a member of the chalcogen family.
	www.medicalglossary.org /elements_chalcogens_definitions.html (307 words)

	Process for preparation of chalcogens and chalcogenide alloys of controlled average crystallite size - Patent 4557922
		Chalcogens and chalcogenide alloys of controlled crystal size are prepared by subjecting the esters to a reduction reaction.
		Also there remains a need for processes for the preparation of noncrystalline chalcogens, and their alloys, and small particle chalcogens and their alloys of desired average crystallite sizes, wherein the resulting particles are easily dispersable in a polymer solvent system.
		It is yet another object of the present invention to provide improved processes for the preparation of high purity chalcogens and chalcogenide alloys of desired morphology and desirable average crystallite size by simultaneously subjecting the corresponding pure esters to a reduction and a coreduction reaction respectively.
	www.freepatentsonline.com /4557922.html (4401 words)

	Coreduction process for incorporation of halogens into chalcogens and chalcogenide alloys - Patent 4624701
		A process for the preparation of halogenated chalcogens, or halogenated chalcogenide alloys which comprises providing in solution pure esters of the desired chalcogen, and subsequently subjecting a mixture of the esters and a chalcogenide halide to a coreduction reaction.
		It is yet another object of the present invention to provide improved processes for the preparation of halogenated high purity chalcogens, and chalcogenide alloys by simultaneously subjecting a mixture of the corresponding pure esters, and halogenated analogs, such as a chalcogenide halide, to a coreduction reaction.
		The process of the present invention involves subjecting a mixture of high purity chalcogen or chalcogenide esters, and their halogenated analogs, inclusive of chalcogen halides, to a simultaneous coreduction reaction enabling the generation of a chalcogen or an alloy with a halogen chemically bonded thereto.
	www.freepatentsonline.com /4624701.html (4344 words)

	Class Schedule for Class 556 ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
		Plural -C(=X)- groups, wherein X is chalcogen, bonded directly to the same non-benzenoid carbons, or the enolate thereof.
		Chalcogen or -C(=X)-, wherein X is chalcogen, bonded directly to the unsaturated 5-membered carbocyclic ring
		Chalcogen, nitrogen, halogen or -C(=X)-, wherein X is chalcogen, bonded directly to at least one of the carbocyclic rings
	www.uspto.gov /web/patents/classification/uspc556/sched556.htm (1574 words)

	JCE 2001 (78) 1333 [Oct] A Second Note on the Term "Chalcogen"
		In a recent note Jensen (1) traced the etymology of the term "chalcogen" or "ore former" and showed that many of the derivations of this word given in modern textbooks are incorrect.
		These names quickly became popular in the work group of Hannover because they were analogous to the well-known terms "halogens" ("salt formers") and "halogenides" for the neighboring elements in the periodic table, the majority of halogenides being salts and chalcogenides being ores.
		Heinrich Remy's suggestion led to the recommendation "the elements oxygen, sulfur, selenium and tellurium may be called chalcogens and their compounds chalcogenides" (6).
	jchemed.chem.wisc.edu /Journal/Issues/2001/Oct/abs1333_1.html (692 words)

	U.S. Patent Subclass 556/continued - ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) (Site not responding. Last check: 2007-11-05)
		- 40 Plural -C(=X)- groups, wherein X is chalcogen, bonded directly to the same non-benzenoid carbons, or the enolate thereof.
		- 48 Chalcogen or -C(=X)-, wherein X is chalcogen, bonded directly to the unsaturated 5-membered carbocyclic ring
		- 145 Chalcogen, nitrogen, halogen or -C(=X)-, wherein X is chalcogen, bonded directly to at least one of the carbocyclic rings
	cxp.paterra.com /usclassC556S001xx1m.html (3015 words)

	U.S. Patent Subclass 546/continued - ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) (Site not responding. Last check: 2007-11-05)
		- 5 The metal is bonded directly to chalcogen of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens, which group is attached directly or indirectly to the six-membered hetero ring by nonionic bonding
		- 6 The metal is bonded directly to chalcogen which chalcogen is attached directly or indirectly to the six-membered hetero ring by nonionic bonding
		- 110 Chalcogen or -C(=X)-, wherein X is chalcogen, attached directly to the six membered hetero ring by nonionic bonding
	cxp.paterra.com /usclassC546S001xx2m.html (4653 words)

	Publications: Shallow donors in diamond: chalcogens, pnictogens, and their hydrogen complexes (Site not responding. Last check: 2007-11-05)
		The utility of diamond as an electronic material is compromised by the lack of a suitable shallow donor.
		Here, ab initio theory is used to investigate the donor levels of substitutional pnictogen (N, P, As, and Sb) and chalcogen (S, Se, and Te) impurities and chalcogen-hydrogen defects in diamond.
		Substitutional S is found to be a deep donor, while As and Sb possess donor levels significantly shallower than P, which so far is the most effective shallow donor found by experiment.
	www.phys.ncl.ac.uk /includes/printerfriendly.php?theURL=/research/pubs/abs51.htm (128 words)

	Selenium History - Selenium Information
		Selenium is the third element in Group 16 of the periodic family.
		The members of this family are sometimes referred to as the chalcogens, meaning "ore-forming." Selenium has an atomic number of 34, an atomic mass of 78.96, and a chemical symbol of Se.
		For example, birds visiting the Kesterson Reservoir in California are exposed to very high levels of selenium in the water and, over the past decades, have shown an increasing number of genetic deformities caused by the element.
	www.bookrags.com /sciences/chemistry/selenium-woc.html (531 words)

	US PATENT SUBCLASS 556 / 183-- .~.~.~.~ At least one of the chalcogens is part of a -C(=X)X- group, ... (Site not responding. Last check: 2007-11-05)
		.~.~.~.~ At least one of the chalcogens is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens
		.~.~.~.~ At least one of the chalcogens is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens {1}
		(under subclass 182) Compounds in which at least one of the chalcogens is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens.
	www.patentec.com /data/class/defs/556/183.html (186 words)

	Chalcogen (Site not responding. Last check: 2007-11-05)
		Los chalcogens son el nombre para el grupo periódico 16 (viejo-estilo de la tabla: VIB o VÍA) en la tabla periódica.
		Un término como la ' fuerza de los chalcides ha sido un derivado más lógico del chalcogen, como el halide es de halógeno, pero la lengua científica es, como cualquier lengua, no siempre lógica.
		El número de la oxidación del chalcogen es generalmente -2 en un chalcogenide pero otros valores (e.g.
	www.yotor.net /wiki/es/ch/Chalcogen.htm (256 words)

	Class 556: ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES ( Manual of U.S. Patent Classification )
		Having -C(=X)-, wherein X is chalcogen, attached indirectly to silicon by nonionic bonding
		Chalcogen attached directly to the nitrogen by nonionic bonding
		The sulfur is part of a -SH or -SC(=X)- group, wherein X is chalcogen (H of -SH may be replaced by a substituted or unsubstituted ammonium ion or a Group IA or IIA light metal)
	www.uspto.gov /web/offices/ac/ido/oeip/taf/moc/556.htm (2394 words)

	Chalcogens Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-11-05)
		Looking For chalcogens - Find chalcogens and more at Lycos Search.
		Find chalcogens - Your relevant result is a click away!
		Look for chalcogens - Find chalcogens at one of the best sites the Internet has to offer!
	www.karr.net /search/encyclopedia/Category:Chalcogens (173 words)

	FDTC Chemistry Web Site: CHM_110_MainGroupElements_r4 - By Charles Taylor (charles.taylor@fdtc.edu) (Site not responding. Last check: 2007-11-05)
		The chalcogens, like the previous group, range from nonmetals (oxygen, sulfur, selenium) to metalloids (tellurium) to metals (polonium).
		You're familiar with the common chalcogens - oxygen and sulfur.
		Oxygen is a gas, while the rest of the chalcogens are solids.
	fdtc.edu /FacultyArea/users/TaylorC/CHM_110_MainGroupElements_r4.html (1010 words)

	Tellurium History Summary (Site not responding. Last check: 2007-11-05)
		Tellurium is the fourth element in Group 16 of the periodic table, a group of elements sometimes known as the chalcogens.
		Tellurium has an atomic number of 52, an atomic mass of 127.60, and a chemical symbol of Te.
		A growing application of tellurium is in electrical and electronic devices, such as photocopiers, printers, and infrared detection systems.
	www.bookrags.com /history/chemistry/tellurium-woc (359 words)

	Chalcogenide Glasses (Site not responding. Last check: 2007-11-05)
		This makes chalcogenide glasses different from crystalline semiconductors in that crystalline semiconductors are more easily doped by the introduction of substitutional impurities.
		The glass-forming ability of chalcogens originates from the large size of the anions which allows them to combine with other elements in a wide range of proportion.
		The large size and weak bond strengths of the chalcogens give them low vibrational frequencies which gives them the property of having good transmission into the infrared (IR) with a large optical gap.
	www.engr.sjsu.edu /eallen/MATE152/CaseStudies/OpticalStorage/chalcoge.htm (467 words)

	Amazon.de: Bücher: Compounds with Br, I, the Chalcogens (S, Se, Te, Po), B, and C. (Supp. B. Teil 2) (Site not responding. Last check: 2007-11-05)
		Amazon.de: Bücher: Compounds with Br, I, the Chalcogens (S, Se, Te, Po), B, and C. (Supp.
		Compounds with Br, I, the Chalcogens (S, Se, Te, Po), B, and C. (Supp.
		Zum Seitenanfang : Compounds with Br, I, the Chalcogens (S, Se, Te, Po), B, and C. (Supp.
	www.amazon.de /exec/obidos/ASIN/3540936947/eingutesbuch-21 (314 words)

	US PATENT SUBCLASS 556 / 89-- .~.~.~.~.~ Plural chalcogens bonded directly to the metal (Site not responding. Last check: 2007-11-05)
		> At least one of the chalcogens is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens {2}
		> Having -C(=X)X-, are the same or diverse chalcogens, attached indirectly to the metal by nonionic bonding (e.g., dialkyl tin thioglycollic acid esters, etc.)
		(under subclass 88) Compounds wherein at least two chalcogens are bonded directly to the metal.
	www.patentec.com /data/class/defs/556/89.html (139 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		A Group #2 Kuenzli,Ben Yew (111626087) & Warner,Kathryn Lee (111608061) Group 16: Chalcogens Pierson,Lena Ann (111689005) The intro to the presentation could use more structure, it was a little hard to follow.
		Overall, I felt it was a very good presentation.
		Flow was a little choppy, but the available time was filled well.
	www-rohan.sdsu.edu /faculty/eliot/c111reviews.txt (546 words)

	Cell containing chalcogenide cathode, alkali metal anode and solid halo-aluminum alkali metal compound electrolyte - ...
		wherein M' is one or more metals selected from the group consisting of titanium, zirconium, hafnium, niobium, tantalum and vanadium, wherein Z is one or more chalcogens selected from the group consisting of oxygen, sulfur, selenium and tellurium, and wherein n is a numerical value between about 1.8 and about 3.2; and
		wherein M' is one or more metals selected from the group consisting of titanium, zirconium, hafnium, niobium, tantalum and vanadium, Z is one or more chalcogens selected from the group consisting of oxygen, sulfur, selenium and tellurium, and n is a numerical value between about 1.8 and about 3.2.
		Advantageously, M' is one or more metals selected from the group consisting of titanium, niobium, tantalum and vanadium.
	www.freepatentsonline.com /4066824.html (2053 words)

	Reactions of a Germacyclopropabenzene with Elemental Chalcogens: Syntheses and Structures of a Series of Stable ... (Site not responding. Last check: 2007-11-05)
		Reactions of a Germacyclopropabenzene with Elemental Chalcogens: Syntheses and Structures of a Series of Stable 2H-Benzo[c][1,2]chalcogenagermetes
		This is the first example of a ring expansion reaction of cyclopropabenzene derivatives using elemental chalcogen, while several types of ring-opening reactions have been explored for cyclopropabenzene so far.
		The skeletons of chalcogenagermetes have very little strain in their four-membered rings annelated with a benzene ring.
	pubs.acs.org /cgi-bin/abstract.cgi/orgnd7/2005/24/i04/abs/om049216q.html (172 words)

	Springer WienNewYork - Intrinsic Point Defects, Impurities, and Their Diffusion in Silicon (Site not responding. Last check: 2007-11-05)
		Basically all properties of semiconductor devices are influenced by the distribution of point defects in their active areas.
		This book contains the first comprehensive review of the properties of intrinsic point defects, acceptor and donor impurities, isovalent atoms, chalcogens, and halogens in silicon, as well as of their complexes.
		Special emphasis is placed on compiling the structures, energetic properties, identified electrical levels and spectroscopic signatures, and the diffusion behavior from experimental and theoretical investigations.
	www.springer.at /main/book.jsp?bookID=3-211-20687-6&categoryID=6 (279 words)

	US PATENT SUBCLASS 540 / 340-- .~.~.~.~.~.~.~.~.~.~.~ Having -C(=X)X-, wherein the X's may be the same ...
		.~.~.~.~.~.~.~.~.~.~.~ Having -C(=X)X-, wherein the X's may be the same or diverse chalcogens, in chain between the ring and the -C(=X)- group
		.~.~ Hetero ring is four-membered containing nitrogen and having chalcogen double bonded directly to a ring carbon which is adjacent to the ring nitrogen {7}
		(under subclass 338) Compounds wherein the chain between the ring and the - - group is a - - X - group, wherein the X's may be the same or diverse chalcogens, (i.e., oxygen, sulfur, selenium or tellurium).
	www.patentec.com /data/class/defs/540/340.html (279 words)

	chalcogens - OneLook Dictionary Search (Site not responding. Last check: 2007-11-05)
		We found 2 dictionaries with English definitions that include the word chalcogens:
		Tip: Click on the first link on a line below to go directly to a page where "chalcogens" is defined.
		chalcogens : The On-line Medical Dictionary [home, info]
	onelook.com /?w=chalcogens (76 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		An atom has 5 valence electrons — 2 are in an s-subshell and 3 in a p-subshell.
		(A) alkali metals (B) alkaline earth metals (C) pnictogens (D) chalcogens (E) halogens 2.
		(A) alkali metals (B) alkaline earth metals (C) pnictogens (D) chalcogens (E) halogens 3.
	www.chem.uh.edu /freshman/Bott/Chem1301/2003SpringTest2.doc (2859 words)

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