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Topic: Main group element

	Group 6 element - Wikipedia, the free encyclopedia
		A Group 6 element is the series of elements in group 6 (IUPAC style) in the periodic table, which consists of the transition metals chromium (Cr), molybdenum (Mo), tungsten (W), and seaborgium (Sg).
		"Group 6" is the new IUPAC name for this group, the old style name was "group VIA" in the old European system or "group VIB" in the old US system.
		Group 6 must not be confused with the group with the old-style group names of either VIB (European system) or VIA (US system) which is now group 16.
	en.wikipedia.org /wiki/Group_6_element (223 words)

	Atomic orbital - Wikipedia
		The chemistry of the main group elements is dominated primarily by the electronic configuration in just the s and p orbitals; that of the transition metals by the electronic configuration of electrons in the d orbitals; and that of the lanthanides and actinides by the electronic configuration of electrons in the f orbitals.
		Progressing through a group from lightest element to heaviest element, the outer-shell electrons (those most readily accessible for participation in chemical reactions) are all in the same type of orbital, with a similar shape, but with increasingly higher energy and average distance from the nucleus.
		In francium, the heaviest element of the group, the outer-shell electron is in the seventh-shell orbital, significantly further out on average from the nucleus than those electrons filling all the shells below it in energy.
	nostalgia.wikipedia.org /wiki/Atomic_orbital (358 words)

	PlanetMath: order (of a group)
		By Lagrange's theorem, the order of any element in a finite group divides the order of the group.
		Cross-references: divides, Lagrange's theorem, identity element, integer, positive, finite, group
		This is version 6 of order (of a group), born on 2002-04-23, modified 2005-02-10.
	planetmath.org /encyclopedia/OrderOfAGroupElement.html (87 words)

	Atoms&Ions: Chapter Explanation - Chemical Bonding
		In fact, the number of valence electrons of an element is related to its position in the periodic table - it is equal to the unit digit of the column of a main-group element.
		It is also important to mention that the valence of an element indicates the number of electrons involved in bonding to acheive the electron configuration of the closest inert gas.
		Elements at the left and in the center of the periodic table are metals, which lose electrons easily.
	www.aub.edu.lb /~hyaghi/LessonSamples/Atom/pages/explanations/cmpds.htm (1354 words)

	CMS—About the Heavy Elements Group (Site not responding. Last check: 2007-11-03)
		The objective of this research is to study the solution chemistry of the transactinide elements and the similar transition metals and main-group element chemical homologs.
		Trends in the chemical properties among the members of a particular chemical group are affected by subtle changes in the ionization potentials of the valence electrons, caused by the increased importance of relativistic effects induced by the high nuclear charges.
		At present, we are focusing on the chemical properties of the elements in groups 4a, 2b, and 8, prompted by our recent discovery of an element-114 isotope with a 30-second lifetime; only a single atom was produced in a month-long experiment.
	www-cms.llnl.gov /e114/about.html (1298 words)

	Novel synthesis of difunctional halo organo noncarbon group IV main group element amides - Patent 5082958
		The method as described in claim 1 wherein the terminal valences of the noncarbon Group IV main group element are satisfied by radicals selected from the group consisting of organic radicals, alkoxy radicals, nitrogen radicals, hydrogen atoms, halogen atoms and divalent, noncarbon Group IV main group element-linking, oxygen and nitrogen atoms.
		The noncarbon Group IV main group element may be silicon, germanium or tin and preferably is silicon.
		The reaction of the halo noncarbon Group IV main group element group with an acid salt yields an acid derivative.
	www.freepatentsonline.com /5082958.html (4509 words)

	The <linkGrp> element
		The element provides a convenient way of establishing a default for the type attribute on a group of links of the same type: by default, the type attribute on a element has the same value as that given for type on the enclosing .
		Sample values include: all: if the element pointed to is itself a pointer, then the target of that pointer will be taken, and so on, until an element is found which is not a pointer.
		one: if the element pointed to is itself a pointer, then its target (whether a pointer or not) is taken as the target of this pointer.
	pauillac.inria.fr /cdrom_a_graver/www/XCorpus/manual/node343.html (414 words)

	Advanced Main Group Chemistry (I) - Rings, Chains, Clusters (Site not responding. Last check: 2007-11-03)
		The covalent element hydrogen bonds that are found in molecular hydrides are usually polarized (important exception: hydrocarbons) with the hydrogen bearing a positive partial charge and the bonding partner bearing a negative partial charge (a).
		The elements in the periodic table can largely be grouped into nonmetals (to the left of the periodic table), metals (to the right of the periodic table) and a group of elements that are borderline cases and are called "metalloids" (B, Si, Ge, P, As, Se)
		Moreover, the calculated mass of element 43 shown in their spectrum is consistent with the amount that would be now expected from the spontaneous fission of U present in the ores they studied.
	131.104.156.23 /Lectures/CHEM_462/462_chapter_1.html (7137 words)

	boron group element -- Encyclopædia Britannica
		The elements are boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).
		They are characterized as a group by having three electrons in the outermost parts of their atomic structure.
		(It is customary to refer to horizontal series of elements in the table as periods and vertical series as groups.) The seven elements lithium to fluorine and the seven corresponding elements sodium to chlorine...
	www.britannica.com /eb/article-9110608?tocId=9110608&query=molecular (908 words)

	Main Group Elemental Hydrides
		The main group elements are then normalised to the corresponding main group elemental hydrides, a set that includes such well known species as: hydrogen, water, ammonia, methane, lithium hydride, xenon and hydrogen chloride.
		The approach taken by the chemogenesis analysis is to saturation bond each of the first 36 main group elements with a common bonding partner, and then to explore the chemistry of the resulting binary compounds.
		The main group elemental hydrides show patterns of reaction chemistry behaviour which correspond with the s-block and p-block construction of the periodic table, they show real and rich periodicity.
	www.meta-synthesis.com /webbook/02_mge/hydrides.html (1181 words)

	Chapter 14: Periodic Patterns in the Main-Group Elements (Site not responding. Last check: 2007-11-03)
		Second row group IA to IIIA elements are small and tend to polarize the bonds in their compounds giving polar covalent bonds.
		All group IV elements have compounds where the group IV element has a +4 oxidation state; however only carbon and silicon have compounds where they are in the -4 charge state.
		is a main constituent of the earth’s crust.
	chemserv.venturacollege.edu /doliver3/chem1b/notes/CHAP14new.htm (3101 words)

	General Chemistry Online: Glossary:
		Mass percentages express the concentration of a component in a mixture or an element in a compound.
		A sample of an element is converted into a stream of ions and passed through an electromagnetic field.
		The smallest particle of an element or compound that retains the chemical properties of the element or compound.
	antoine.frostburg.edu /chem/senese/101/glossary/m.shtml (1485 words)

	Main group element - Wikipedia, the free encyclopedia
		In chemistry and atomic physics, main group elements are groups whose lightest members are represented by hydrogen, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and helium as arranged in the periodic table of the elements.
		The main group elements (with some of the lighter transition metals) are the most abundant elements on the earth, in the solar system, and in the universe.
		This page was last modified 23:01, 26 September 2005.
	en.wikipedia.org /wiki/Main_group_element (95 words)

	On the Probability That a Group Element is P-Singular - Isaacs, Kantor, Spaltenstein (ResearchIndex) (Site not responding. Last check: 2007-11-03)
		In order to prove the Main Theorem, in view of Sections 2 and 3 we may assume that the group G appearing in that theorem lies between G 0 and AutG 0.
		Isaacs, W. Kantor and N. Spaltenstein, On the probability that a group element is p--singular (to appear in J. Algebra).
		2 The centralizers of semisimple elements of the Chevalley gro..
	citeseer.ist.psu.edu /181173.html (765 words)

	Non Classical Effects in Main Group Elements (Site not responding. Last check: 2007-11-03)
		The nomenclature used for multiply bonded Group 14 compounds, especially those of silicon, is a little confusing and not consistent in all literature.
		As outlined in Section 1.1, thermodynamically multiply bonded compounds of the heavy main group elements are unstable with respect to polymerization:
		symmetry and the a and b labels are used to specify the behaviour of the orbitals under the symmetry elements that the molecule possesses.
	www.hull.ac.uk /php/chsajb/non-classical/handout_1.html (3017 words)

	Main group chemistry hydrogen and hydrides Information (Site not responding. Last check: 2007-11-03)
		Main Group Chemistry Hydrogen And Hydrides are great for when you're looking to get better at main group chemistry hydrogen and hydrides for selfish purposes.
		The main group elemental hydrides show patterns of reaction chemistry behaviour which...
		In main group element hydrides electronegativity of an element respective to hydrogen determines the...
	hydrogen.4newinfo2.info /hydrogen-powered-vehicles/main-group-chemistry-hydrogen-and-hydrides.html (322 words)

	ACME Press Release 1 (Site not responding. Last check: 2007-11-03)
		, is a colourless odourless gaseous main group element which belong to Group Vlb of the periodic table.
		Oxygen is the chemical element in the periodic table that has the symbol O and atomic number 8.
		The element is very common, found not only on Earth but throughout the universe, usually bound with other elements.
	www.thebigox.com /pr01.htm (405 words)

	Fastflo Finite Element PDE Package
		Fastflo is a finite element package for the numerical solution of partial differential equations (PDEs) in one-, two- and three-dimensional regions.
		As a general PDE solver, fastflo’s main advantage is its flexibility in specifying models in two and three dimensions and algorithms to solve them.
		Finite element operations like assembly and solving are invoked by simple commands.
	www.nag.co.uk /simulation/Fastflo/fastflo.asp (294 words)

	Glossary: M (Site not responding. Last check: 2007-11-03)
		An element in one of the groups of the periodic table in which s and p orbitals are filled.
		An element that is solid, has a metallic luster, is malleable and ductile, and conducts both heat and electricity.
		A reaction in which atoms or groups of atoms are interchanged, but none of the atoms undergo a change in oxidation number.
	xenon.che.ilstu.edu /genchemhelphomepage/glossary/m.html (717 words)

	Kenton H. Whitmire, Scholarly Interests, Rice University (Site not responding. Last check: 2007-11-03)
		Synthetic Inorganic and Organometallic Chemistry with an emphasis on the chemistry of the heavy main group elements and mixed main group element-transition metal compounds.
		Alkoxo- and oxo-complexes of the heavy main group elements are also being actively examined.
		He was a NATO postdoctoral fellow at Cambridge University in Cambridge, England and a recipient of an Alexander von Humboldt Research Fellowship to study at the University of Göttingen in Germany (1987 and 1989-1990).
	dacnet.rice.edu /faculty?FDSID=439 (1166 words)

	Evans Group Research Project Descriptions (Site not responding. Last check: 2007-11-03)
		The Evans Group is examining the utility of lanthanide metal catalysts in the synthesis of unusual hydrocarbon polymers.
		The Evans Group is interested in materials containing europium and terbium since these elements have intense, energy-efficient emission in the red and green regions of the spectrum, respectively, and are used in many practical devices ranging from color TV to energy efficient fluorescent lamps to flat panel displays.
		The Evans Group collaborates closely with Dr. John Greaves, head of the UCI Department of Chemistry Mass Spectroscopy Facility, to use new aspects of mass spectroscopy for the advancement of organometallic chemistry.
	chem.ps.uci.edu /~wevans/resrch/resdes.html (3087 words)

	van Arkel-Kelelaar Triangles
		The chemical elements and binary compounds exhibit three extremes of bond and associated material type: metallic, ionic and covalent.
		There are 36 main group elements and there are approximately 650 binary (dielemental) compounds/materials derived from the first 36 main group elements, the first 45:
		The Allen triangle of bonding is restricted to period 3 elements.
	www.meta-synthesis.com /webbook/37_ak/triangles.html (987 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		While the chemistry of metal-carbon bonds has been thoroughly explored by numerous research groups during the past forty years, the chemistry of metal-boron bonds has received little attention.
		For instance, while metal-boryl (M-BR2) species are known for the late transition elements, no examples exist for the early transition metals.
		We are currently investigating chemistry related to this important area for olefin complexes of Group 4 and 5 metallocenes and have observed an unusual ÒB-H/C-HÓ metathesis of coordinated ethylene.
	www.cem.msu.edu /~gradoff/faculty/smith.html (352 words)

	Main Group Chemistry – Dr N (Site not responding. Last check: 2007-11-03)
		E.A for group 1 is exothermic, whereas group 2 and the noble gases are endothermic.
		DEN between elements is a useful guide to the nature of the compound.
		For elements, metallic bonding is important (however could be either covalent or ionic).
	sis.bris.ac.uk /~mr1303/Notes/inorchem.htm (1919 words)

	[No title]
		Write the electron configuration for nitrogen, N. Relate the position of an element on the Periodic Table of Elements to the electron configuration of an atom of that element.
		An element that has the electron configuration of 1s22s22p2 is in Group and Period.
		Elements in the same group or column can be expected to have similar Locate the different families of main-group elements on the periodic table and describe their characteristic properties.
	www.msu.edu /~giangaco/Activities/finalreview.doc (868 words)

	Site-Specific Recognition of a 70-Base-Pair Element Containing d(GA)n Repeats Mediates bithoraxoid Polycomb Group ... (Site not responding. Last check: 2007-11-03)
		PSR corresponds to the pairing-sensitive element defined by Sigrist and Pirrotta (52), and the dark line marked BP identifies the fragment described by Horard et al.
		Identification of Polycomb and trithorax group responsive elements in the regulatory region of the Drosophila homeotic gene Sex combs reduced.
		The Drosophila Polycomb Group proteins ESC and E(Z) are present in a complex containing the histone-binding protein p55 and the histone deacetylase RPD3.
	mcb.asm.org /cgi/content/full/21/14/4528 (8611 words)

	Sulphur (Site not responding. Last check: 2007-11-03)
		Sulphur, S, is a yellow nonmetallic main group element belonging to the Group VIb of the periodic table.
		Although sulphur is in the same group in the periodic table as oxygen, there are more differences in the chemical characteristics of these elements than there are similarities.
		Sulphur is widely distributed as the free element and combined in compounds.
	www.ucc.ie /ucc/depts/chem/dolchem/html/elem/elem016.html (554 words)

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