Silicon is a chemical element (its symbol in chemical formula expressions is Si) that is present in sand and glass and which is the best known semiconductor material in electronic components.Its atomic number is 14.The most common isotope has atomic weight 28. Silicon is a chemical element with symbol Si and atomic number 14. It is a tetravalent metalloid, more reactive than germanium, the metalloid directly below it in the table.
Sand, quartz, rock crystal, amethyst, agate, flint, jasper, and opal are all silicon oxides. Granite, hornblende, asbestos, feldspar, clay, mica are a few of the many silicate minerals. Silicon makes up 25.7% of the earth's crust by weight and is the second most abundant element in the earth's crust. 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 1 CLASSIFICATION OF ELEMENTS Matter is classified into solids, liquids and gases. However this is not the only way of classification of the matter. It is also classified into elements, compounds and mixtures based on composition. In order to understand the elements, let us consider examples of the substances like Iron, silver etc. which we come across in our day to day life.  Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure free element in nature. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates. Measured by mass, silicon makes up 27.7% of the Earth's crust and is the second most abundant element in the crust, with only oxygen having a greater abundance. Silicon is usually found in the form of complex silicate minerals, and less often as silicon dioxide (silica, a major component of common sand). Silicon was discovered by Joens 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 the seventh most abundant element in the universe and the second most abundant element in the earth's crust. Today, silicon is produced by heating sand (SiO 2) with carbon to temperatures approaching 2200°C. Two allotropes of silicon exist at room temperature: amorphous and crystalline. Element Silicon-Si. Comprehensive data on the chemical element Silicon is provided on this page; including scores of properties, element names in many languages, most known nuclides of Silicon. Common chemical compounds are also provided for many elements.  Silicon is a chemical element with symbol Si and atomic number 14. It is a tetravalent metalloid, more reactive than germanium, the metalloid directly below it in the table. Controversy about silicon's character dates to its discovery; it was first prepared and characterized in pure form in 1823. Measured by mass, silicon makes up 27.7% of the Earth's crust and is the second most abundant element in the crust, with only oxygen having a greater abundance. Silicon is usually found in the form of complex silicate minerals, and less often as silicon dioxide (silica, a major component of common sand). Part of the Computing fundamentals glossary: Silicon is a chemical element (its symbol in chemical formula expressions is Si) that is present in sand and glass and which is the best known semiconductor material in electronic components. Its atomic number is 14. The most common isotope has atomic weight 28. Silicon is found also in minerals such as asbestos, feldspar, clay and mica. Silicon is important in plant and animal life. Diatoms in both fresh and salt water extract silica from the water to use as a component of their cell walls. Silicon is an important ingredient in steel. Silicon makes up 25.7% of the earth's crust by weight and is the second most abundant element in the earth's crust. Silicon is present in the sun and stars and is a principal component of a class of meteorites known as aerolites. Silicon dioxide (SiO 2), silicon's most common compound, is the most abundant compound in the earth's crust. It commonly takes the form of ordinary sand, but also exists as quartz, rock crystal, amethyst, agate, flint, jasper and opal. Silicon dioxide is extensively used in the manufacture of glass and bricks. Silica gel, a colloidal form of silicon dioxide, easily absorbs moisture and is used as a desiccant. Silicon forms other useful compounds. Silicon is the seventh most abundant element in the universe and the second most abundant element in the earth's crust. Today, silicon is produced by heating sand (SiO 2) with carbon to temperatures approaching 2200°C. Two allotropes of silicon exist at room temperature: amorphous and crystalline
http://www.webelements.com/silicon/ http://kea.kar.nic.in/vikasana/bridge/chemistry/chap_08a.pdf https://en.wikipedia.org/wiki/Silicon http://education.jlab.org/itselemental/ele014.html http://environmentalchemistry.com/yogi/periodic/Si.html https://en.wikipedia.org/wiki/Silicon http://whatis.techtarget.com/definition/silicon-Si http://www.webelements.com/silicon/ http://education.jlab.org/itselemental/ele014.html
what is silicon element classification