left colspan 2 small Commonly included colspan 2 rowspan 4 style text align right small The metalloid ... frequency with which some elements appear in metalloid lists. Frequencies are from the list of metalloid ... above because of the relatively small sample size. tag ref Sample size 194 list of metalloid lists lists of metalloid lists , as of August 23, 2011. Mean appearance frequencies were Cluster ... A metalloid is a chemical element with properties that are in between ref Deming & Hendricks 1942 Deming ... agreed or rigorous definition of a metalloid. ref name goldsmith Goldsmith1982 Goldsmith ... The term metalloid was first popularly used to refer to nonmetals. Its more recent meaning as a category ..., see the main article for each element. Consistent with the list of metalloid lists , boron ... not regarded as a metalloid. ref name Swift EH 1962, p. 100 Swift1962 Swift & Schaefer ... nature of arsenic and the mildly therapeutic value of borax. With the development of metalloid ... is metalloid in nature, appearing quite metallic in its ability to alloy with metals. Germanium ... agreed or rigorous definition of the term metalloid. So the answer to the question Which elements are metalloids .... 218 220 ref In any event, individual metalloid classification arrangements tend to share common ... 276 ref although it has some metallic properties and is occasionally classified as a metalloid. ref ... more details
File Metalloid cluster frequencies.png thumb Elements in the list of metalloid lists as at 23 Aug 2011 n 194 have appearance frequencies that occur in clusters of comparable values. The diamonds in the above graph mark the mean appearance frequency of each cluster. Cluster 1 93 per cent B, Si, Ge, As, Sb, Sb, Te cluster 2 44 Po, At cluster 3 24 Se cluster 4 9 C, Al cluster 5 5 Be, P, Bi cluster 6 3 S, Sn, Uuh and cluster 7 1 H, Ga, I, Pb, Uuq, Uup, Uus. The resulting geometric trend line has the formula y 199.47e sup 0.7423x sup and an R sup 2 sup value of 0.9962. Lists of metalloids differ since there is no universally agreed or rigorous definition of the term metalloid or its occasional alias, semi metal . tag ref See Goldsmith RH 1982, Metalloids , Journal of Chemical Education , vol. 59, no. 6, pp. 526 527, DOI 10.1021 ed059p526 Hawkes SJ 2001, Semimetallicity , Journal of Chemical Education, vol. 78, no. 12, pp. 1686 87, DOI 10.1021 ed078p1686 group n The metalloid lists in this article have been sorted by year, author and edition. The second row of the table gives the appearance count for each element, as a percentage. This figure needs to be manually checked, and updated if needs be, each time there is a new entry or a correction to the main body of the table. A hashmark next to an element means that its inclusion as a metalloid, in that particular reference, is qualified in some way by the author s. When adding up the appearance count for each element, a hashmark entry has a value of one half a blank entry has a value of zero 0 and all other entries have a value ..., Re What is the metalloid line and where is it located on the Periodic Table? , MadSci Network ref ... 7 align center align left Crystal 2007 ref Crystal D ed. 2007, metalloid , in The Penguin Concise ... Online 2011, http www.britannica.com EBchecked topic 377645 metalloidmetalloid , viewed 14 July ... Lists of chemical elements metalloid lists ... more details
Complex metal hydrides are salts wherein the anions contain hydride s. In the older chemical literature as well as contemporary Solid state chemistry materials science textbooks, a metal hydride is assumed to be nonmolecular, i.e. three dimensional lattices of atomic ions. In such systems, hydrides are often interstitial and nonstoichiometric compound nonstoichiometric , and the bonding between the metal and hydrogen atoms is significantly ionic bonding ionic . In contrast, complex metal hydrides typically contain more than one type of metal or metalloid and may be soluble but invariably react with water. They exhibit ionic bonding between a positive metal ion with molecular anion s containing the hydride. In such materials the hydrogen is bonded with significant covalent character to the second metal or metalloid atoms. ref name Holle Holleman, A. F. Wiberg, E. Inorganic Chemistry Academic Press San Diego, 2001. ISBN 0 12 352651 5. ref Examples In general, complex metal hydrides have the formula M sub x sub M sub y sub H sub n sub , where M is an alkali metal cation or cation complex and M is a metal or metalloid. Well known examples feature group 13 element s, especially boron and aluminium including sodium aluminium hydride , NaAlH sub 4 sub also known as sodium alanate , lithium aluminum hydride , LiAlH sub 4 sub , and lithium borohydride , LiBH sub 4 sub . Complex metal hydrides are often soluble in ether ial solvent s. Other complex metal hydrides are numerous. Illustrative examples include the salts MgBr THF sub 2 sub sub 4 sub FeH sub 6 sub and Potassium nonahydridorhenate K sub 2 sub ReH sub 9 sub . ref name Holle See also Hydride Ionic hydrides Ionic hydrides Hydrogen storage References reflist Category Metal hydrides Category Inorganic chemistry Category Hydrogen storage ... more details
. Toxic heavy metals Antimony a metalloid Arsenic see arsenic poisoning is a metalloid Barium Beryllium ... , americium , etc. Polonium a metalloid Radioactive isotopes of metallic elements not otherwise ... more details
extremes are the saved and unsaved people....Unfortunately there is an intermediate group, the metalloid ... an unsaved person at times. You should not be a metalloid Christian. p.179 ref name FI ref Cite ... more details
metalloid Common allotropes of boron have bandgap s of approximately 2 eV, but a Allotropes of boron ... 964163.pdf title Structures and Properties of Metalloid Al and Ga Clusters Open Our Eyes to the Diversity ... Silicon 3 14 style background Element color Metalloids metalloid Under increasing pressure silicon ... ref Germanium 4 14 style background Element color Metalloids metalloid Germanium undergoes a semiconductor ... Metalloids metalloid Selenium 4 16 style background Element color Nonmetals nonmetal Selenium undergoes ... style background Element color Metalloids metalloid Tellurium 5 16 style background Element color Metalloids metalloid Tellurium undergoes a semiconductor to metal transition at 4 GPa. ref name Suski ... background Element color Metalloids metalloid Astatine 6 17 style background Element color Halogens ... more details
Unreferenced date December 2009 Infobox Album See Wikipedia WikiProject Albums Name Box Type compilation Artist Klinik Commented out because image was deleted Cover Klinik Box.jpg Released 1990 Recorded 1984 1988 Genre Industrial music Industrial Length 115 44 Label Antler Subway Producer Marc Verhaeghen Reviews Last album Insane Terror br 1989 This album Box br 1990 Next album Black Leather br 1990 Box , a compilation of rare and unreleased tracks by Klinik , was released as a 3LP or 2CD box with a 24 page booklet, containing song lyrics and photos by Sabine Voss. The 2CD was re released in 2004 by Hands Productions . Track listing Disc one tracklist title1 Nautilus II length1 1 45 title2 Colour of your Heart length2 4 10 title3 Surviving in Europe length3 6 15 title4 Entrance length4 8 15 title5 Wired length5 5 10 title6 Under the Black Sun length6 8 40 title7 Insane Terror length7 5 30 title8 The Kiss of Death length8 9 10 title9 Escape length9 2 43 title10 Talking to a Stranger length10 2 05 title11 Target length11 6 00 total length 59 43 Disc two tracklist title1 Decay length1 21 55 title2 Metalloid length2 2 50 title3 Immortal Flesh length3 2 42 title4 The Tree of Life length4 10 42 title5 Walking with Shadows length5 5 00 title6 Get Lost length6 3 28 title7 Sleepwalkin length7 5 20 title8 Nautilus III length8 4 20 total length 56 17 DEFAULTSORT Box Klinik Album Category Klinik albums Category Double compilation albums Category Triple compilation albums Category 1990 compilation albums 1990s album stub ... more details
Infobox mountain name Antimony Peak photo Antimony 225071.jpg photo caption Antimony specimen from Antimony Peak elevation ft 6848 elevation ref NGVD29 ref name pb cite peakbagger pid 1261 name Antimony Peak, California accessdate 2009 07 01 ref prominence ft 888 prominence ref ref name pb listing Hundred Peaks Section ref name hps cite hps id 04D name Antimony Peak accessdate 2009 12 09 ref location Kern County, California Kern County , California California, USA range San Emigdio Mountains coordinates coord 34.8769197 119.1123291 format dms region US type mountain source gnis display inline,title ref name gnis cite gnis id 269552 name Antimony Peak accessdate 2009 03 06 ref topo United States Geological Survey USGS Pleito Hills first ascent easiest route Hike, YDS 1 ref name hps Antimony Peak is a steep peak located in southern Kern County , in the San Emigdio Mountains of the Transverse Ranges , California . The land is administered by the Los Padres National Forest . It was named by W. P. Blake, a Pacific Railroad surveyor in 1854 after he identified a suspected vein of silver ore on the mountain as being the metalloid antimony . ref name gudde cite book first Erwin last Gudde coauthors William Bright title California Place Names year 2004 edition Fourth publisher University of California Press page 15 isbn 0 520 24217 3 ref References reflist External links cite summitpost id 400904 name Antimony Peak accessdate 2009 12 09 Category San Emigdio Mountains Category Mountains of Kern County, California Category Los Padres National Forest California south geo stub ... more details
See also Book Chemical elements sorted alphabetically Book Chemical elements sorted by number saved book title Periodic table subtitle cover image Periodic Table Armtuk3.svg cover color Periodic table Overview Periodic table History of the periodic table History Alternative periodic tables Alternatives Chemical element Element Isotope Atomic orbital Orbital Groups Group periodic table Group Alkali metal Group 1 alkali metals Alkaline earth metal Group 2 alkaline earth metals Group 3 element Group 3 Group 4 element Group 4 Group 5 element Group 5 Group 6 element Group 6 Group 7 element Group 7 Group 8 element Group 8 Group 9 element Group 9 Group 10 element Group 10 Group 11 element Group 11 Group 12 element Group 12 Boron group Group 13 boron group Carbon group Group 14 carbon group Nitrogen group Group 15 nitrogen group Chalcogen Group 16 chalcogens Halogen Group 17 halogens Noble gas Group 18 noble gases Periods Period periodic table Period Period 1 element Period 1 Period 2 element Period 2 Period 3 element Period 3 Period 4 element Period 4 Period 5 element Period 5 Period 6 element Period 6 Period 7 element Period 7 Extended periodic table Extensions Blocks Block periodic table Block s block p block d block f block Other divisions Transition metal Lanthanide Actinide Metal Metalloid Nonmetal Platinum group Noble metal Post transition metal Transuranium element Transactinide element See also Table of nuclides Island of stability Category Wikipedia books on the periodic table Category Wikipedia books on chemical elements Category Periodic table Wikipedia books on elements ... more details
For the class of chemical element s on the periodic table metalloid Cleanup article date April 2008 Image Semimetal.PNG frame This diagram illustrates a direct semiconductor A , an indirect semiconductor B , and a semimetal C . According to Band theory electronic band theory , solids can be classified as insulators, semiconductors, semimetals, or metals. In insulators and semiconductors the filled valence band is separated from an empty conduction band by a band gap . For insulators, the magnitude of the band gap is larger e.g. 4 eV than that of a semiconductor e.g. 4 eV . Metal s have a partially filled conduction band. A semimetal is a material with a very small overlap between the bottom of the Electrical conduction conduction Electronic band structure band and the top of the valence band . A semimetal thus has no band gap and a negligible density of states at the Fermi level . A metal, by contrast, has an appreciable density of states at the Fermi level because the conduction band is partially filled. ref cite book first Gerald last Burns title Solid State Physics year 1985 publisher Academic Press, Inc. isbn 0 12 146070 3 pages 339 40 ref The insulating semiconducting states differ from the semimetallic metallic states in the temperature dependency of their electrical conductivity. With a metal which has only one type of charge carrier electrons , the conductivity decreases with increases in temperature due to increasing interaction of electrons with phonons lattice vibrations . With an insulator or semiconductor which have two types of charge carriers holes and electrons , both the carrier mobilities and carrier concentrations will contribute to the conductivity and these have different temperature dependencies. Ultimately, it is observed that the conductivity of insulators and semiconductors increase with initial increases in temperature above absolute zero as more ... two As, Sb are also considered metalloids but the terms semimetal and metalloid are not synonymous ... more details
wiktionarypar te t TE Te or TE may refer to or be used for TOC right Codes and units te, the ISO 639 1 language code for Telugu language Air New Zealand s former IATA airline code, as in flight TE901 FlyLal s IATA airline code Te, a symbol for tonne notably in the offshore and nuclear industries. Business Telecom Egypt , an Egyptian telephone company Telecom Eireann , Ireland s national telephone company defunct Tracking error , a measure of how closely a portfolio follows the index to which it is benchmarked Linguistics Te Cyrillic , , a letter in the Cyrillic alphabet Te kana , , a Japanese kana Te, the singular definite article in the M ori language People T. E. Lawrence , aka Lawrence of Arabia Trent Edwards , an American football player Tiffany Evans , an American singer and actress Science and medicine TE buffer , a commonly used buffer solution in molecular biology TE mode , a type of transverse mode of electromagnetic radiation Tellurium , a brittle silver white metalloid element Thioescaline , a psychoactive drug Transposable element , a sequence of DNA that can move about in the genome, including transposons Trial and error , a general method of problem solving Thromboembolism , medicine Te, a shorthand for extraverted thinking, a term used in Myers Briggs Type Indicator De Chinese , also transliterated as Te , a concept in Chinese philosophy Theistic evolution Sport Tight end , a position in American football Te martial arts , the Okinawan martial arts Engineering and technology Terminal Equipment , a term used in communications Test engineer Tractive effort Traffic Engineering Transportation Engineering Transportation Engineer Type enforcement , an IT security concept TE cooler , a solid state electronic cooler Other uses TE, a shorthand for the Province of Teramo Teramo province in Italy T , a surname See also Teh disambiguation disambig Category Initialisms br Te dishe velout ca Te desambiguaci cs TE de TE eo Te es T desambiguaci n eu Te fa TE ... more details
The term metallome has been introduced by R.J.P. Williams by analogy with proteome as distribution of free metal ions in every one of Cell biology cellular compartments. Subsequently, the term metallomics has been coined as the study of metallome. Szpunar 2005 defined metallomics as comprehensive analysis of the entirety of metal and metalloid species within a cell or tissue type . Therefore, metallomics can be considered a branch of metabolomics , even though the metals are not typically considered as metabolites . Hiroki Haraguchi gave an alternative definition of metallomes as metalloprotein s or any other metal containing biomolecules , and metallomics as a study of such biomolecules. In the study of metallomes the transcriptome, proteome and the metabolome will constitute the whole metallome. A study of the metallome is done to arrive at the metallointeractome The metallotranscriptome word introduced by Shanker et al. 2009 by can be ideally defined as the map of the entire transcriptome in the presence of biologically or environmentally relevant concentrations of an essential or toxic metal, respectively metallometabolome would constitute the complete pool of small metabolites in a cell at any given time and this would give rise to the whole metallointeractome and knowledge of this would be of paramount importance in comparative metallomics dealing with toxicity and drug discovery. Shanker et al. 2009 See also Bioinorganic chemistry omics Metallomics journal External links http www.rsc.org metallomics Metallomics, the journal covering the research fields related to biometals References cite journal author Mounicou, S., Szpunar, J. and Lobinski, R. title Metallomics the concept and methodology journal Chemical Society Reviews year 2009 volume 38 pages 1119&ndash 1138 doi 10.1039 b713633c pmid 19421584 issue 4 cite journal author Williams, R.J.P. title Chemical selection of elements by cells journal Coordination Chemistry Reviews year 2001 volume 216&ndash 217 pa ... more details
The filler metal FM alloy s that can be produced as amorphous brazing foils ABF are eutectic compositions formed by transition metal s such as nickel , iron , copper , etc., in combination with metalloid s, such as silicon , boron and phosphorus . In conventional crystalline state, all these materials are inherently brittle and cannot be produced in continuous forms such as foil, wire, etc. Therefore, they were available only as powders, pastes, or their derivates. On the other hand, the very presence of metalloids at or near the eutectic concentration promotes the rapid solidification RS conversion of such alloys into a ductile amorphous foil. Production The production of amorphous alloy s requires a manufacturing technology that operates on the basis of the necessary cooling rates, which is known as rapid solidification, or melt spinning technology. Amorphous structures are characterized by the absence of a crystal lattice or a long range order. With this random, spatially uniform arrangement of the constituent atoms, their structure is similar to that of liquids. The nature of this production process is the reason why amorphous alloys are offered only in the form of thin, ductile metal foils. Subsequently, tapes, parts and preforms can be made by e.g. slitting, cutting, stamping and etching. Properties Amorphous brazing foils are compositionally much more uniform even after crystallization, they melt over a narrow temperature range under transient heating. This is a consequence of the shorter distances over which atoms of different elements have to diffuse in order to form a uniform liquid phase. The resulting instant melting and their superior flow characteristic is only one of the important features of ABFs. The absence of the residual organic solvent bases evident in powder paste tapes correspondingly eliminates soot formation and furnace fouling. The low level of gaseous impurities in ABFs, due to the specific characteristics of its production technology, is ... more details
Metalloles are Inorganic chemistry inorganic derivatives of cyclopentadiene in which the carbon atom at position 5, the saturated carbon, is replaced by an inorganic atom. In contrast to its parent compound, the numbering of the metallole starts at the heteroatom . Some of these compounds are described as organometallic compounds, but in the list below quite a number of metalloid s are present too. ref cite journal last1 Tracy first1 Henry J. last2 Mullin first2 Jerome L. last3 Klooster first3 Wim T. last4 Martin first4 James A. last5 Haug first5 Judith last6 Wallace first6 Scott last7 Rudloe first7 Isaac last8 Watts first8 Kimberly title Enhanced Photoluminescence from Group 14 Metalloles in Aggregated and Solid Solutions journal Inorganic Chemistry volume 44 issue 6 pages 2003 year 2005 pmid 15762727 doi 10.1021 ic049034o ref Many metalloles are fluorescent and are used in organic light emitting diodes OLEDs and other applications. Metalloles, which can also be viewed as structural analog s of pyrrole , include class wikitable style text align center float right margin left 0.5em Calculated geometry and inversion barrier energy E for some C sub 4 sub H sub 4 sub MH metalloles ref name geo cite journal last1 Pelzer first1 Silke last2 Wichmann first2 Karin last3 Wesendrup first3 Ralf last4 Schwerdtfeger first4 Peter title Trends in Inversion Barriers IV. The Group 15 Analogous of Pyrrole journal The Journal of Physical Chemistry A volume 106 pages 6387 year 2002 doi 10.1021 jp0203494 ref Name M d M C , ngstr m d M H , C M C , E , kJ mol Pyrrole N 1.37 1.01 110 0 Phosphole P 1.81 1.425 90.5 67 Arsole As 1.94 1.53 86 125 Stibole Sb 2.14 1.725 80.5 160 Bismole Bi 2.24 1.82 78 220 Arsole , a moderately aromatic arsenic analog Bismole , a bismuth analog Borole , a boron analog Gallole , a gallium analog Germole , a germanium analog Phosphole , a phosphorus analog Plumbole , a lead analog Pyrrole , a nitrogen analog Selenophene , a selenium analog Silole , a silico ... more details
these are usually considered to be metalloid s. ref name Egdell cite web url http weblearn.ox.ac.uk ... from the metalloid s by their significantly higher boiling points and conductivity in the same ... are also included, although these are usually considered to be metalloid s or semi metals . Elements ... more details
Chembox verifiedrevid 400872697 ImageFile Polonium dichloride xtal 2x2x2 1955 3D balls.png ImageSize IUPACName OtherNames Section1 Chembox Identifiers CASNo PubChem SMILES Section2 Chembox Properties Formula PoCl sub 2 sub MolarMass 279.91 g mol sup 1 sup Appearance ruby red solid ref name H&W Holleman&Wiberg page 594 ref Density 6.50 g cm sup 3 sup ref name Bagnall cite journal journal Journal of the Chemical Society Resumed J. Chem. Soc. year 1955 pages 2320 2326 doi 10.1039 JR9550002320 title The polonium halides. Part I. Polonium chlorides author1 K. W. Bagnall author2 R. W. M. D Eye, J. H. Freeman author separator , author name separator last3 Freeman first3 J. H. ref MeltingPt 355 C Sublimation chemistry sublimes at 130 C ref name H&W BoilingPt Solubility Section3 Chembox Hazards MainHazards FlashPt Autoignition Polonium dichloride is a chemical compound of the radioactive metalloid polonium and chlorine . Its chemical formula is PoCl sub 2 sub . Structure Polonium dichloride appears to crystallise with an orthorhombic unit cell in either the P 222, P mm2 or Pmmm space group , although this is likely a pseudo cell. Alternatively, the true space group may be monoclinic or triclinic, with one or more cell angles close to 90 . ref name Bagnall Assuming the space group is P 222, the structure exhibits distorted cubic coordination of Po as PoCl sub 8 sub and distorted square planar coordination of Cl as ClPo sub 4 sub . File Polonium dichloride xtal 1955 3D Po coordination 3D balls.png 120px Distorted cubic coordination of polonium by eight chlorines File Polonium dichloride xtal 2x2x2 1955 3D SF.png 120px Space filling model of 2x2x2 unit cells 8 cells in total Preparation PoCl sub 2 sub can be obtained either by halogenation of polonium metal or by dehalogenation of polonium tetrachloride , PoCl sub 4 sub . ref name H&W Methods for dehalogenating PoCl sub 4 sub include thermal decomposition at 300 C, reduction of cold, slightly ... more details
In chemistry, redistribution usually refers to the exchange of anionic ligands bonded to metal and metalloid centers. The conversion does not involve redox, in contrast to disproportionation reactions. Redistribution reactions are usefully conducted at higher temperatures upon cooling the mixture, the product mixture is kinetically frozen and the individual products can be separated. In cases where redistribution is rapid at mild temperatures, the reaction is less useful synthetically but still important mechanistically. Examples Useful redistribution reactions are found in organoaluminium compound organoaluminium , organoboron chemistry organoboron , and organosilicon chemistry . ref Greenwood, N. N. & Earnshaw, A. 1997 . Chemistry of the Elements 2nd Edn. , Oxford Butterworth Heinemann. ISBN 0 7506 3365 4. ref ref Many mixed organo chloro derivatives of many metalloids are produced in this manner. In one example, R. K ster, P. Binger, E. R. Chlorodiethylborane and Chlorodiphenylborane Inorganic Syntheses, Volume 15, pp. 149 153, 2007. DOI 10.1002 9780470132463.ch33 ref BCl sub 3 sub 2 B C sub 2 sub H sub 5 sub sub 3 sub 3 BCl C sub 2 sub H sub 5 sub sub 2 sub In another example, tetramethylsilane is an undesirable product of the industrially important direct process , but it can be converted recycled into more useful products by redistribution with silicon tetrachloride SiMe sub 4 sub SiCl sub 4 sub 2 SiMe sub 2 sub Cl sub 2 sub In organotin chemistry , the mixed alkyl tin chlorides are produced by redistribution ref name Ullmann G. G. Graf Tin, Tin Alloys, and Tin Compounds in Ullmann s Encyclopedia of Industrial Chemistry, 2005 Wiley VCH, Weinheim DOI 10.1002 14356007.a27 049 ref 3 SnBu sub 4 sub SnCl sub 4 sub 4 SnBu sub 3 sub Cl Many metal halide s undergo redistribution reactions, usually to afford nearly statistical mixtures of products. For example, titanium tetrachloride and titanium tetrabromide redistribute their halide ligands, one of many reactions in this conversion ... more details
, 32, 18, 6 Oxygen and sulfur are nonmetal s, and selenium, tellurium, and polonium are metalloid semiconductor ... s bgcolor element color Metalloids Metalloid s bgcolor element color Poor metals Post transition ... more details
for the concept in nonlinear control Feedback passivation for the concept in spacecraft Passivation spacecraft Passivation , in physical chemistry and engineering , is a material becoming passive in relation to being less affected by environmental factors such as air or water. It means a shielding outer layer of corrosion which can be demonstrated with a micro coating or found occurring spontaneously in nature. Passivation is useful in strengthening, and preserving the appearance of, wikt metallic Adjective metallics . As a technology technique , passivating is using a light coat of material such as Metal oxide adhesion metal oxide to create a shell against corrosion . Passivation can only occur in certain conditions, and is used in microelectronics to enhance silicon. ref IUPAC http goldbook.iupac.org P04443.html Goldbook ref In air, almost all metals what date December 2011 Is that true for metallics too or not? form a hard inert surface naturally. The reduction of the corrosive rate will vary individually in various shells, but is most notably pronounced in aluminium , zinc , titanium , and silicon a metalloid metal metalloid loid . The shell inhibits deeper corrosion, and that is the key factor. The layer is usually an oxide or nitride with a thickness of what date December 2011 nanometers. Mechanisms Image Pourbaix Diagram of Iron.svg thumb Pourbaix diagram of iron. ref http people.bath.ac.uk chsataj CHEY0016 20Lecture 2015.htm University of Bath & http www.wou.edu las physci ch412 pourbaix.htm Western Oregon University ref The conditions necessary for passivation are recorded in Pourbaix diagram s. Some corrosion inhibitor s help the formation of a passivation layer on the surface of the metals to which they are applied. Some compounds, dissolving in solutions chromate s, molybdates form non reactive and low solubility films on metal surfaces. Specific materials Silicon In the area of microelectronics, the formation of a strongly adhering passivating oxide is ... more details
In chemistry a Zintl phase is the product of a reaction between group 1 alkali metal s or group 2 alkaline earth s and post transition metal s or metalloid s from group 13, 14, 15 or 16. Zintl phases were named for the German chemist Eduard Zintl who investigated them in the 1930s. ref name Kauzlarich S.M. Kauzlarich, Encyclopedia of Inorganic chemistry, 1994, John Wiley & Sons, ISBN 0 471 93620 0 ref The term Zintl Phases was first used by Fritz Laves Laves in 1941. ref name Kauzlarich Zintl phases are a subgroup of brittle , high melting point intermetallic compounds which are diamagnetism diamagnetic or exhibit temperature independent paramagnetism , are poor Electrical conduction conductors or semiconductor s. ref name Sevov Sevov, S.C., Zintl Phases in Intermetallic Compounds, Principles and Practice Progress, Westbrook, J.H. Freisher, R.L. Eds. John Wiley & Sons. Ltd., Chichester, England, 2002, pp. 113 132 ref Zintl noted that there was an atomic volume contraction when these compounds were formed and realised this could indicate cation formation. ref name Sevov He suggested that the structures of Zintl phases were ionic, where there was complete electron transfer from the more electropositive metal. ref name Sevov The structure of the ion anion nowadays called the Zintl ion should then be considered on the basis of the resulting electronic state. These ideas were further developed to become the Zintl rule or Zintl Klemm concept , where the polyanion structure should be similar to an isoelectronic element. ref name Kauzlarich Examples of Zintl phases NaTl, where it is now known that the structure consists of a polymeric anion Tl sup nowiki &minus nowiki sup sub n sub with a covalent diamond structure with Na sup sup ions fitted into the anionic lattice. ref name Kauzlarich NaSi where the polyanion is tetrahedron tetrahedral Si sub 4 sub sup 4 nowiki &minus nowiki sup similar to phosphorus molecule P sub 4 sub . ref name Kauzlarich Na sub 2 sub Tl which the po ... more details
Collective names of groups of like elements is the term used by IUPAC to describe IUPAC nomenclature nomenclature for categorization of chemical element s. ref http www.iupac.org reports provisional abstract04 connelly 310804.html IUPAC Provisional Recommendations for the Nomenclature of Inorganic Chemistry 2004 online draft of an updated version of the Red Book IR 3 6.2 ref The following names are approved by IUPAC Alkali metal s The metals of group 1 Li, Na, K, Rb, Cs, Fr. Alkaline earth metal s The metals of group 2 Be, Mg, Ca, Sr, Ba, Ra. Pnictogen s The elements of group 15 N, P, As, Sb, Bi. Chalcogen s The elements of group 16 O, S, Se, Te, Po. Halogen s The elements of group 17 F, Cl, Br, I, At. Noble gas es The elements of group 18 He, Ne, Ar, Kr, Xe, Rn. Lanthanoid s Elements 57 71 La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu. Actinoid s Elements 89 103 Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No, Lr. Rare earth element s Sc, Y, and the lanthanoids. Transition metal s Elements in groups 3 to 12. SITENAME uses the below hybrid system in its periodic table and chemical element related articles Same as the IUPAC system above for Alkali metals, Alkaline earth metals, Halogens, Noble gases, Lanthanoids, Actinoids, and Transition metals. Rare earth elements, Pnictogens and Chalcogens are not used. Leftover elements are grouped as Other metal s Metals that are not otherwise categorized Al, Ga, In, Sn, Tl, Pb, Bi Metalloid s B, Si, Ge, As, Sb, Te, Po Other non metal s Non metals that are not otherwise categorized H, C, N, O, P, S, Se Many other names for groups of elements are in common use, and yet others have been used throughout history. Some examples include Precious metal Variously defined group of non radioactive metals of high economical value Platinum group Ru, Rh, Pd, Os, Ir, Pt. Noble metal Variously defined group of metals that are generally resistant to corrosion. Usually includes Ag, Au, and the platinum group metals. Heavy meta ... more details
James P. Collman born 1932 in Beatrice, Nebraska is an American Professor of Chemistry. He is currently serving at Stanford University in California. Collman is considered a pioneer in bioinorganic and biomimetic chemistry. He developed a clearer understanding of the mechanisms of biological proteins, by studying synthetic analogs of biological systems which contain metal and metalloid atoms. His work on hemoglobin, myoglobin and cytochrome c oxidase allowed subsequent researchers to understand how the protein metal interactions allow these molecules to function. ref Chemical & Engineering News , 19 January 2009, p. 73 ref Career Collman received B.S. 1954 and M.S. degrees 1956 in Chemistry from the University of Nebraska Lincoln . He received a Ph.D. degree from the University of Illinois at Urbana Champaign in 1958 under Reynold C. Fuson . Upon receiving his Ph. D., Collman joined the faculty of University of North Carolina at Chapel Hill , remaining there until 1967, when he moved to Stanford University. He currently holds the George & Hilda M. Daubert Endowed Chair in Chemistry at Stanford. Collman has contributed to several aspects of transition metal chemistry. He has authored 3 books and over 366 Academic publishing scientific papers . In the 1960s his group demonstrated that certain metal acetylacetonate s undergo Friedel Crafts like reactions, indicating that these chelate rings have aromatic character. Through reviews as well as original research, his group popularized the oxidative addition reaction, leading to the discovery of new low valent complexes including Ru CO sub 3 sub PPh sub 3 sub sub 2 sub and IrCl N sub 2 sub PPh sub 3 sub sub 2 sub . Collman s reagent , Na sub 2 sub Fe CO sub 4 sub , prepared in his laboratories, enables certain C C coupling reactions in organic synthesis . He popularized the use of tetraphenylporphyrin as a Biomimicry biomimetic Ligand biochemistry ligand for exploring the structure and function of myoglobin , cytochrome P4 ... more details
the halogen s and the noble gas es and metalloid s. Nevertheless, metal s tend to have many ... of white phopshorus Gray arsenic, polymeric As metalloid Black arsenic molecular and non metallic ... the stable form metalloid yellow antimony non metallic black antimony non metallic explosive Polonium ... more details
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