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Topic: Silicon

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In the News (Sun 19 Nov 17)

  Chemistry : Periodic Table : silicon : key information
Silicon is present in the sun and stars and is a principal component of a class of meteorites known as aerolites.
Silicon makes up 25.7% of the earth's crust by weight, and is the second most abundant element, exceeded only by oxygen.
Silicon is found also in minerals such as asbestos, feldspar, clay and mica.
www.webelements.com /webelements/elements/text/Si/key.html   (365 words)

  Silicon - LoveToKnow 1911
Silicon hydride, SiH4, is obtained in an impure condition, as a spontaneously inflammable gas, by decomposing magnesium silicide with hydrochloric acid, or by the direct union of silicon and hydrogen in the electric arc.
Silicon nitrogen hydride, SiNH, is a white powder formed with silicon amide when ammonia gas (diluted with hydrogen) is brought into contact with the vapour of silicon chloroform at -10° C. Trianilino silicon hydride, SiH (NHC 6 H 5) 3, is obtained by the action of aniline on a benzene solution of silicon chloroform.
From the alloy containing 25% of silicon, the excess of magnesium is removed by a mixture of ethyl iodide and ether and a residue consisting of slate-blue octahedral crystals of magnesium silicide is left.
www.1911encyclopedia.org /Silicon   (2378 words)

 Silicon - MSN Encarta
Silicon is prepared as a brown amorphous powder or as gray-fl crystals.
Silicon dioxide is the principal constituent of sand.
Silicon is a semiconductor, in which the resistivity to the flow of electricity at room temperature is in the range between that of metals and that of insulators.
encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761571760   (811 words)

 Silicon - Wikipedia, the free encyclopedia
Silicon is the principal component of most semiconductor devices and, in the form of silica and silicates, in glass, cement, and ceramics.
Silicon is widely used in semiconductors because it remains a semiconductor at higher temperatures than the semiconductor Germanium and because its native oxide is easily grown in a furnace and forms a better semiconductor/dielectric interface than almost all other material combinations.
Silicon is commercially prepared by the reaction of high-purity silica with wood, charcoal, and coal, in an electric arc furnace using carbon electrodes.
en.wikipedia.org /wiki/Silicon   (2152 words)

Silicon is, next to oxygen, the most abundant element in the earth's crust and is found in plants, animals and in most living organisms.
Silicon is not bound in plasma, where it is believed to exist almost entirely as monomeric silicic acid.
Silicon is available in multivitamin preparations, usually in the form of silicon dioxide or magnesium trisilicate, typically at doses of about 2 milligrams.
www.pdrhealth.com /drug_info/nmdrugprofiles/nutsupdrugs/sil_0235.shtml   (663 words)

 Silicon   (Site not responding. Last check: )
Silicon is present in the sun and stars and is a principal component of a class of meteorites known as "aerolites." It is also a component of tektites, a natural glass of uncertain origin.
Silicon is prepared commercially by heating silica and carbon in an electric furnace, using carbon electrodes.
Silicon is an important ingredient in steel; silicon carbide is one of the most important abrasives and has been used in lasers to produce coherent light of 4560 A. Regular grade silicon (99%) costs about $0.50/g.
www.scescape.net /~woods/elements/silicon.html   (571 words)

It occurs in clay, feldspar, granite, quartz and sand, mainly in the form of silicon dioxide (also known as silica) and as silicates, (various compounds containing silicon, oxygen and one or another metal).
Silicon is the principal component of most semiconductor devices and, in the form of siliica and silicates, in glass, cement, ceramics.
Silicon is widely used in semiconductors because it has a lower reverse leakage current than the semiconductor Germanium, and because its native oxide is easily grown in a furnace and forms a better semiconductor/dielectric interface than almost all other material combinations.
www.brainyencyclopedia.com /encyclopedia/s/si/silicon.html   (1819 words)

 Supplemental Silicon   (Site not responding. Last check: )
Silicon is present in two separate compounds that assist and aid the body in specific tissue processes.
While silicon is a natural occurring substance in nature, the latter (silicone) is made by man using controversial polymers that are popular in the industrial workplace.
Silicon may also be of great importance in the formation and maintenance of bone health.
www.supplementnews.org /silicon   (781 words)

 Silicon Valley - Wikipedia, the free encyclopedia
Silicon Valley encompasses the northern part of Santa Clara Valley and adjacent communities in the southern parts of the San Francisco Peninsula and East Bay.
Silicon refers to the high concentration of semiconductor and computer-related industries in the area; Valley refers to the Santa Clara Valley, located at the southern end of San Francisco Bay.
Unfamiliar with silicon, writers assumed that it was a misspelling of silicone, a material used in caulking, breast implants, and other products that had recently been introduced to the public.
en.wikipedia.org /wiki/Silicon_Valley   (2367 words)

 silicon. The Columbia Encyclopedia, Sixth Edition. 2001-05
Silicon is obtained commercially by heating sand and coke in an electric furnace.
Silicon of very high purity is prepared by thermal decomposition of silanes; it is used in transistors and other semiconductor devices.
Silicon is found in many plants and animals; it is a major component of the test (cell wall) of diatoms.
www.bartleby.com /65/si/silicon.html   (360 words)

Silicon (Si) is present in biologic material as a silanate, an ether (or ester-like) derivative of silicic acid which may play a role in the structure of glycosaminoglycans and their protein complexes.
However, silicon found in most diets as aluminosilicate and silica is not absorbable or as available as sodium metasilicate.
The silicon content of drinking water, and beverages made thereof, shows geographical variation; silicon is high in hard water and low in soft water areas.
www.tjclarkminerals.com /german/minerals/SILICON.htm   (405 words)

 Silicon - Memory Alpha, the Star Trek Wiki
Silicon is a common element present in stars and is a principal component of meteorites known as aerolites.
Silicon makes up 25.7 percent of the Earth's crust, by mass, and is the second most abundant element, being exceeded only by oxygen.
Silicon is very limited in the many chemical processes needed for life, whereas carbon, in all its multiple forms, can perform them much more efficiently.
memory-alpha.org /en/wiki/Silicon   (266 words)

 silicon-based life
When carbon is oxidized during the respiratory process of a terrestrial organism (see respiration), it becomes the gas carbon dioxide – a waste material that is easy for a creature to remove from its body.
The oxidation of silicon, however, yields a solid because, immediately upon formation, silicon dioxide organizes itself into a lattice in which each silicon atom is surrounded by four oxygens.
Silicon's failure to give rise to many compounds that display handedness makes it hard to see how it could serve as the basis for the many interconnected chains of reactions needed to support life.
www.daviddarling.info /encyclopedia/S/siliconlife.html   (934 words)

 Multicrystalline Silicon Ingot Growth or Directional Solidification Casting
DS of silicon in the same quartz (fused silica) crucible used to melt it would seem to be a logical approach for large-grained ingot production, but sticking and thermal expansion mismatch between the solidified Si and the crucible lead to significant cracking problems.
Silicon is melted on a vertically moveable platform (typically graphite) located within the finger array.
There is Biot and Savart-law repulsion between the current flowing in the periphery of the silicon melt and the currents flowing in the fingers, because they are induced to flow in opposite directions at any particular instant in the RF cycle.
www.siliconsultant.com /SImulticrs.htm   (1214 words)

 Silicon information page. All about silicon and the role it plays in your diet.
Silicon is not present in the body in large amounts, yet is found in virtually every type of tissue in the body.
Silicon is used to keep bones, cartilage, tendons and artery walls healthy and may be beneficial in the treatment of allergies, heartburn and gum disease, as well as assisting the immune system.
Silicon is present in onions, wheat, oats, millet, barley, rice, beetroot, alfalfa as well as leafy green vegetables and whole grains.
www.anyvitamins.com /silicon-info.htm   (388 words)

 Silicon (Si) - Chemical properties, Health and Environmental effects
Silicon is an intrinsic semiconductor in it’s purest form, although the intensity of its semiconduction is highly increased by introducing small quantities of impurities.
Silicon is the principal component of glass, cement, ceramics, most semiconductor devices, and silicones, the latter a plastic substance often confused with silicon.
Silicon dioxide is used as raw material to produce elemental silicon and silicon carbide.
www.lenntech.com /Periodic-chart-elements/Si-en.htm   (928 words)

Silicon has a density of 2.4, and that is high for most metals, so it is usually pretty unreactive, and its boiling and meltig points are pretty high..
Silicon is usually combined in nature, and we use only the pure silicon for our electronics.
Silicon was not revsited untile 1823, when a Swedish chemist named J"ns Berelius did lab expirements that proved "silica" to be an element, and it was renamed silicon and put in its place on the periodic table.
www.mvschools.org /ms/projects/html/blue/silicon.htm   (373 words)

 What is silicon? - A Word Definition From the Webopedia Computer Dictionary   (Site not responding. Last check: )
Silicon is the basic material used to make computer chips, transistors, silicon diodes and other electronic circuits and switching devices because its atomic structure makes the element an ideal semiconductor.
Silicon is commonly doped, or mixed, with other elements, such as boron, phosphorous and arsenic, to alter its conductive properties.
Silicon was first isolated and described as an element in 1824 by Jöns Jacob Berzelius, a Swedish chemist.
www.webopedia.com /TERM/M/silicon.html   (386 words)

 Biosil Silicon - bones and joints - healthy joint cartilage
Silicon is known to act as a cross-linking agent which stabilizes the glycosamino-glycan networks.
So vital is silicon to healthy joint function that in "Maximizing the Arthritis Cure", the follow-up book to "The Arthritis Cure", mention is made to the addition of silicon to everyone's diet, because of the important role silicon has been found to have in bone and cartilage formation.
Silicon is an essential mineral required for the strength and elasticity of bones, joints, connective tissue, hair, skin, nails, mucous membranes and arteries.
www.internetarthritiscenter.com /silicon.html   (820 words)

 It's Elemental - The Element Silicon
Silicon was discovered by Jöns Jacob Berzelius, a Swedish chemist, in 1824 by heating chips of potassium in a silica container and then carefully washing away the residual by-products.
Silicon is the seventh most abundant element in the universe and the second most abundant element in the earth's crust.
Silicon is also an important ingredient in silicone, a class of material that is used for such things as lubricants, polishing agents, electrical insulators and medical implants.
education.jlab.org /itselemental/ele014.html   (264 words)

 PROVET HEALTHCARE INFORMATION - Silicon   (Site not responding. Last check: )
Well, in chicks and rats silicon is essential for normal growth and in chicks it has an important metabolic role in cartilage as silicon-deficiency reduces glycosaminoglycans and collagen concentrations and produces profound pathological changes in epiphyseal cartilage.
Silicon has been shown to be essential for prolyl hydroxylase activity - which is involved in collagen synthesis.
In humans work is on-going but silicon deficiency is possibly involved in osteoarthritis and ageing as well as other disorders including atherosclerosis and hypertension.
www.provet.co.uk /health/diseases/silicon.htm   (292 words)

Silicon differs from carbon in that silicon does not have the same tendency to catenate.
Silicon also differs from carbon in that it does not form pi bonds as readily as carbon does.
Therefore silicon analogs of carbon dioxide and carbon monoxode, which contain double and triple bonds, are not observed.
www.uncp.edu /home/mcclurem/ptable/silicon/si.htm   (666 words)

 silicon - HighBeam Encyclopedia
SILICON [silicon] nonmetallic chemical element; symbol Si; at.
Silicon is the element directly below carbon and above germanium in Group 14 of the periodic table.
With carbon it forms silicon carbide ; with oxygen a dioxide, silica ; with oxygen and metals, silicates.
www.encyclopedia.com /html/s/silicon.asp   (519 words)

 Native Silicon (Si)
Silicon boules are grown (pulled) from a molten state from a seed crystal, in such a way as to produce a single large crystal which must be completely without crystal defects, or the entire boule must be discarded.
or silicon dioxide in any form whether it is in the form of quartz, or any of the Quartz Group members, or as a segment of the chemistry of a silicate, or even as silicon dioxide dissolved in water.
Silicone is a synthetic polymer that is made of silicon, carbon and oxygen and has many medical and some industrial purposes.
mineral.galleries.com /minerals/elements/silicon/silicon.htm   (359 words)

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