It is a white, high-melting-point solid that is relatively chemically inert, being attacked by dilute HF and hot H It is named for its wrinkly appearance, resembling the foot of an elephant.It is one small part of a much larger mass that lies beneath Reactor No. Silica (silicon dioxide) common in sandstone, beach sand, and similar natural materials, is the initial material from which silicones are produced. It is nonmetallic and tetravalentits atom making four electrons available to form covalent chemical bonds.It belongs to group 14 of the periodic table. . We classified hypertrophic scar as a red or dark pink, raised (elevated) sometimes itchy scar confined within the border of the original surgical incision, with spontaneous regression after several months and a generally poor final appearance. Aluminium mirrors are the most reflective of all metal mirrors for the near ultraviolet and far infrared light, and one of the most reflective in the visible spectrum, nearly on par with silver, and the two therefore look similar. Gastrointestinal Endoscopy publishes original, peer-reviewed articles on endoscopic procedures used in the study, diagnosis, and treatment of digestive diseases. Password requirements: 6 to 30 characters long; ASCII characters only (characters found on a standard US keyboard); must contain at least 4 different symbols; Silica (silicon dioxide) common in sandstone, beach sand, and similar natural materials, is the initial material from which silicones are produced. Four in ten likely voters are Silane is an inorganic compound with chemical formula, SiH 4.It is a colourless, pyrophoric, toxic gas with a sharp, repulsive smell, somewhat similar to that of acetic acid. It is found in the gas state at room temperature. It was formed during the Chernobyl disaster in April 1986 and discovered in December 1986. You can add any or all of the official THE POLAR EXPRESS merchandise to your reservation light, which creates the shimmering effect common in many cosmetics. Silane is of practical interest as a precursor to elemental silicon.Silane with alkyl groups are effective water repellents for mineral surfaces such as concrete and masonry. Three isotopes occur naturally, 12 C and 13 C being stable, while 14 C is a Potassium cyanide is a compound with the formula K CN.This colorless crystalline salt, similar in appearance to sugar, is highly soluble in water. It is the most abundant mineral in Earth's crust and is resistant to both chemical and physical weathering. Silane is of practical interest as a precursor to elemental silicon.Silane with alkyl groups are effective water repellents for mineral surfaces such as concrete and masonry. Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae.Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclude the fungi and some algae, as well as the prokaryotes (the archaea and bacteria).By one definition, plants form the clade Viridiplantae Quartz is a hard, crystalline mineral composed of silica (silicon dioxide).The atoms are linked in a continuous framework of SiO 4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2.Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar.. Quartz exists in two forms, the Adderall 7.5 mg and 10 mg contain FD&C Blue #1 Aluminum Lake as a color additive.. Adderall 12.5 mg, 15 mg, 20 mg Quartz is a hard, crystalline mineral composed of silica (silicon dioxide).The atoms are linked in a continuous framework of SiO 4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2.Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar.. Quartz exists in two forms, the It is a noble gas. You can add any or all of the official THE POLAR EXPRESS merchandise to your reservation Neon is a chemical element with the symbol Ne and atomic number 10. Sand is also the principal ingredient of glass, which has thousands of uses. Dimethicone is the most widely used silicone in hair care industry, and entropy is important for its adsorption to the hair surface. It is a white, high-melting-point solid that is relatively chemically inert, being attacked by dilute HF and hot H Inactive Ingredients: colloidal silicon dioxide, compressible sugar, corn starch, magnesium stearate, microcrystalline cellulose and saccharin sodium. ; Agrisilica comes in a range of fertilisers suitable for all types of farming and horticulture including hydro and aquaponic. Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO 2, most commonly found in nature as quartz and in various living organisms. Potential hazards with chlorine dioxide include poisoning and the risk of Password requirements: 6 to 30 characters long; ASCII characters only (characters found on a standard US keyboard); must contain at least 4 different symbols; . In many parts of the world, silica is the major constituent of sand.Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as a synthetic product. Potassium cyanide is a compound with the formula K CN.This colorless crystalline salt, similar in appearance to sugar, is highly soluble in water. It does not hydrolyze when it enters water, and is usually handled as an aqueous solution. Neon is a chemical element with the symbol Ne and atomic number 10. Carbon (from Latin carbo 'coal') is a chemical element with the symbol C and atomic number 6. It was formed during the Chernobyl disaster in April 1986 and discovered in December 1986. Agrisilica delivers the highest PAS content of any bulk commercial 100% natural silicon fertiliser available today. Democrats hold an overall edge across the state's competitive districts; the outcomes could determine which party controls the US House of Representatives. Geological studies of the Moon are based on a combination of Earth-based telescope observations, measurements from orbiting spacecraft, lunar samples, and geophysical data. It is an oxide of sodium, aluminium and silicon, and also contains sulphur which is what provides the vivid blue tone. Mineralogically, opal is a hydrous silicon dioxide with a chemical composition of SiO 2. nH 2 O. Ethylene carbonate (sometimes abbreviated EC) is the organic compound with the formula (CH 2 O) 2 CO. Potential hazards with chlorine dioxide include poisoning and the risk of This powerhouse combo provides ultra long-term protection from the elements and relentless water beading, without sacrificing true optical clarity, extreme depth and that signature ceramic glass-like liquid-gloss appearance. [citation needed] Carbon monoxide has a computed fractional bond order of 2.6, indicating that the "third" bond is important but constitutes somewhat less than a full bond. All Agrisilica fertilisers are approved for use in organic agriculture. Carbon dioxide (chemical formula CO 2) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. Quartz is a hard, crystalline mineral composed of silica (silicon dioxide).The atoms are linked in a continuous framework of SiO 4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2.Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar.. Quartz exists in two forms, the It is an oxide of sodium, aluminium and silicon, and also contains sulphur which is what provides the vivid blue tone. Mineralogically, opal is a hydrous silicon dioxide with a chemical composition of SiO 2. nH 2 O. When rocks weather away, the residual material usually contains quartz. It is the most abundant mineral in Earth's crust and is resistant to both chemical and physical weathering. It is amorphous, without a crystalline structure, and without a definite chemical composition (it contains a variable amount of water, as shown by the "n" in its chemical composition). Six locations were sampled directly during the crewed Apollo program landings from 1969 to 1972, which returned 380.96 kilograms (839.9 lb) of lunar rock and lunar soil to Earth. This compound has been known since ancient times, and in nature, silica is found as quartz. Earth is the third planet from the Sun and the only astronomical object known to harbor life.While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water.About 71% of Earth's surface is made up of the ocean, dwarfing Earth's polar ice, lakes, and rivers.The remaining 29% of Earth's surface is land, consisting of continents and Quartz is a mineral composed of silicon and oxygen, with a chemical composition of SiO 2. Carbon (from Latin carbo 'coal') is a chemical element with the symbol C and atomic number 6. Silicon nitride is a chemical compound of the elements silicon and nitrogen. Using remote sensing from space and the ground, we seek to quantify the underlying processes that drive these changes both their emissions and sinks. Carbon (from Latin carbo 'coal') is a chemical element with the symbol C and atomic number 6. Carbon dioxide (chemical formula CO 2) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. Dimethicone is the most widely used silicone in hair care industry, and entropy is important for its adsorption to the hair surface. Colors: Adderall 5 mg is a white to off-white tablet, which contains no color additives. Plus, you get to fill that tumbler up with FREE COCOA at our caf the day of your ride! The Elephant's Foot is a mass of black corium with many layers, externally resembling tree bark and glass. maintaining a healthy skin appearance. In the air, carbon dioxide is transparent to visible light but absorbs infrared radiation, acting as a greenhouse gas.It is a trace gas in Earth's atmosphere at 417 Aluminium mirrors are the most reflective of all metal mirrors for the near ultraviolet and far infrared light, and one of the most reflective in the visible spectrum, nearly on par with silver, and the two therefore look similar. Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO 2, most commonly found in nature as quartz and in various living organisms. Carbon monoxide has a computed fractional bond order of 2.6, indicating that the "third" bond is important but constitutes somewhat less than a full bond. All Agrisilica fertilisers are approved for use in organic agriculture. With many other names, this oxide of tin is an important material in tin chemistry. Plus, you get to fill that tumbler up with FREE COCOA at our caf the day of your ride! THE POLAR EXPRESS Cocoa Combo Our biggest Savings yet This combo comes with an Exclusive Blanket you cant even get in our gift shop, a matching 8oz Tumbler and a 7 Snowman Plush. The element, when ultrapure, is a solid with a blue-grey metallic sheen. The Elephant's Foot is a mass of black corium with many layers, externally resembling tree bark and glass. It prevents aluminum toxicity by bonding with aluminum. Plutonium dioxide is a stable ceramic material with an extremely low solubility in water and with a high melting point (2,744 C). Using remote sensing from space and the ground, we seek to quantify the underlying processes that drive these changes both their emissions and sinks. ; Agrisilica comes in a range of fertilisers suitable for all types of farming and horticulture including hydro and aquaponic. When rocks weather away, the residual material usually contains quartz. Appearance. A little goes a long way & you can definitely build up the coverage with this. Inactive Ingredients: colloidal silicon dioxide, compressible sugar, corn starch, magnesium stearate, microcrystalline cellulose and saccharin sodium. Colors: Adderall 5 mg is a white to off-white tablet, which contains no color additives. Aluminium mirrors are the most reflective of all metal mirrors for the near ultraviolet and far infrared light, and one of the most reflective in the visible spectrum, nearly on par with silver, and the two therefore look similar. Carbon suboxide, or tricarbon dioxide, is an organic, oxygen-containing chemical compound with formula C 3 O 2 and structure O=C=C=C=O.Its four cumulative double bonds make it a cumulene.It is one of the stable members of the series of linear oxocarbons O=C n =O, which also includes carbon dioxide (CO 2) and pentacarbon dioxide (C 5 O 2).Although if carefully Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO 2, most commonly found in nature as quartz and in various living organisms. It is a noble gas. The Elephant's Foot is a mass of black corium with many layers, externally resembling tree bark and glass. 4 of the Chernobyl Nuclear Power Sand is also the principal ingredient of glass, which has thousands of uses. Geological studies of the Moon are based on a combination of Earth-based telescope observations, measurements from orbiting spacecraft, lunar samples, and geophysical data. It is classified as the cyclic carbonate ester of ethylene glycol and carbonic acid.At room temperature (25 C) ethylene carbonate is a transparent crystalline solid, practically odorless and colorless, and somewhat soluble in water. This powerhouse combo provides ultra long-term protection from the elements and relentless water beading, without sacrificing true optical clarity, extreme depth and that signature ceramic glass-like liquid-gloss appearance. MnO 2 is also used as a pigment and as a Tin(IV) oxide, also known as stannic oxide, is the inorganic compound with the formula SnO 2.The mineral form of SnO 2 is called cassiterite, and this is the main ore of tin. Articles report on outcomes research, prospective studies, and controlled trials of new endoscopic instruments and treatment methods. Appearance. Chip companies try to pack more transistors into chips, enhancing performance and making devices more power efficient. Six locations were sampled directly during the crewed Apollo program landings from 1969 to 1972, which returned 380.96 kilograms (839.9 lb) of lunar rock and lunar soil to Earth. light, which creates the shimmering effect common in many cosmetics. Key findings include: Proposition 30 on reducing greenhouse gas emissions has lost ground in the past month, with support among likely voters now falling short of a majority. Carbon dioxide (chemical formula CO 2) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. Silicon dioxide, also known as silica, is a chemical compound that is an oxide of silicon. Get the latest science news and technology news, read tech reviews and more at ABC News. Plus, you get to fill that tumbler up with FREE COCOA at our caf the day of your ride! Sand is also the principal ingredient of glass, which has thousands of uses. Chlorine dioxide is a chemical compound with the formula ClO 2 that exists as yellowish-green gas above 11 C, a reddish-brown liquid between 11 C and 59 C, and as bright orange crystals below 59 C. This compound has been known since ancient times, and in nature, silica is found as quartz. Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae.Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclude the fungi and some algae, as well as the prokaryotes (the archaea and bacteria).By one definition, plants form the clade Viridiplantae It prevents aluminum toxicity by bonding with aluminum. Silica (silicon dioxide) common in sandstone, beach sand, and similar natural materials, is the initial material from which silicones are produced. It was formed during the Chernobyl disaster in April 1986 and discovered in December 1986. Dimethicone is the main ingredient of the two-in-one shampoos. Adderall 7.5 mg and 10 mg contain FD&C Blue #1 Aluminum Lake as a color additive.. Adderall 12.5 mg, 15 mg, 20 mg Carbon suboxide, or tricarbon dioxide, is an organic, oxygen-containing chemical compound with formula C 3 O 2 and structure O=C=C=C=O.Its four cumulative double bonds make it a cumulene.It is one of the stable members of the series of linear oxocarbons O=C n =O, which also includes carbon dioxide (CO 2) and pentacarbon dioxide (C 5 O 2).Although if carefully Four in ten likely voters are In the air, carbon dioxide is transparent to visible light but absorbs infrared radiation, acting as a greenhouse gas.It is a trace gas in Earth's atmosphere at 417 The element, when ultrapure, is a solid with a blue-grey metallic sheen. Sand (silicon dioxide or silica) and clay (aluminium silicate) are used to make concrete and cement. Colors: Adderall 5 mg is a white to off-white tablet, which contains no color additives. 4 of the Chernobyl Nuclear Power Password requirements: 6 to 30 characters long; ASCII characters only (characters found on a standard US keyboard); must contain at least 4 different symbols; Most KCN is used in gold mining, organic synthesis, and electroplating.Smaller applications include jewellery for chemical gilding and buffing.. Potassium cyanide is highly toxic.The moist solid emits small amounts of hydrogen Key findings include: Proposition 30 on reducing greenhouse gas emissions has lost ground in the past month, with support among likely voters now falling short of a majority. Ethylene carbonate (sometimes abbreviated EC) is the organic compound with the formula (CH 2 O) 2 CO. With many other names, this oxide of tin is an important material in tin chemistry. Potassium cyanide is a compound with the formula K CN.This colorless crystalline salt, similar in appearance to sugar, is highly soluble in water. It is an oxide of sodium, aluminium and silicon, and also contains sulphur which is what provides the vivid blue tone. Manganese dioxide is the inorganic compound with the formula MnO 2.This blackish or brown solid occurs naturally as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules.The principal use for MnO 2 is for dry-cell batteries, such as the alkaline battery and the zinccarbon battery. We classified hypertrophic scar as a red or dark pink, raised (elevated) sometimes itchy scar confined within the border of the original surgical incision, with spontaneous regression after several months and a generally poor final appearance. Plutonium dioxide is a stable ceramic material with an extremely low solubility in water and with a high melting point (2,744 C). Carbon makes up only about 0.025 percent of Earth's crust. Si 3 N 4 is the most thermodynamically stable and commercially important of the silicon nitrides, and the term "silicon nitride" commonly refers to this specific composition. Quartz is a mineral composed of silicon and oxygen, with a chemical composition of SiO 2. Manganese dioxide is the inorganic compound with the formula MnO 2.This blackish or brown solid occurs naturally as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules.The principal use for MnO 2 is for dry-cell batteries, such as the alkaline battery and the zinccarbon battery. maintaining a healthy skin appearance. It is a colourless, diamagnetic, amphoteric solid. With many other names, this oxide of tin is an important material in tin chemistry. It is nonmetallic and tetravalentits atom making four electrons available to form covalent chemical bonds.It belongs to group 14 of the periodic table. The element, when ultrapure, is a solid with a blue-grey metallic sheen. The appearance of scar, including scar type, scar size and scar color was assessed by the physician. Gallium arsenide (GaAs) is a III-V direct band gap semiconductor with a zinc blende crystal structure.. Gallium arsenide is used in the manufacture of devices such as microwave frequency integrated circuits, monolithic microwave integrated circuits, infrared light-emitting diodes, laser diodes, solar cells and optical windows.. GaAs is often used as a substrate material for the THE POLAR EXPRESS Cocoa Combo Our biggest Savings yet This combo comes with an Exclusive Blanket you cant even get in our gift shop, a matching 8oz Tumbler and a 7 Snowman Plush. Lead(II,IV) oxide, also called red lead or minium, is the inorganic compound with the formula .A bright red or orange solid, it is used as pigment, in the manufacture of batteries, and rustproof primer paints.It is an example of a mixed valence compound, being composed of both Pb(II) and Pb(IV) in the ratio of two to one. This is why the sand at most of the world's beaches is quartz. The appearance of scar, including scar type, scar size and scar color was assessed by the physician. Fortunately, the levels of the resulting emissionsmostly carbon dioxide and sulfur dioxidecan't do much harm to the people working at silicon refineries or to the immediate environment. It is nonmetallic and tetravalentits atom making four electrons available to form covalent chemical bonds.It belongs to group 14 of the periodic table. When rocks weather away, the residual material usually contains quartz. Gallium arsenide (GaAs) is a III-V direct band gap semiconductor with a zinc blende crystal structure.. Gallium arsenide is used in the manufacture of devices such as microwave frequency integrated circuits, monolithic microwave integrated circuits, infrared light-emitting diodes, laser diodes, solar cells and optical windows.. GaAs is often used as a substrate material for the Quartz is a mineral composed of silicon and oxygen, with a chemical composition of SiO 2. Geological studies of the Moon are based on a combination of Earth-based telescope observations, measurements from orbiting spacecraft, lunar samples, and geophysical data. Get the latest science news and technology news, read tech reviews and more at ABC News. Three isotopes occur naturally, 12 C and 13 C being stable, while 14 C is a In many parts of the world, silica is the major constituent of sand.Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as a synthetic product. Silane is an inorganic compound with chemical formula, SiH 4.It is a colourless, pyrophoric, toxic gas with a sharp, repulsive smell, somewhat similar to that of acetic acid. Just spray on and wipe off, with this game-changing SiO2 (Silicon Dioxide) and TiO2 (Titanium Dioxide) blend. There's no weird residual clumps that you get from the silicon based solutions, however you will get that "blurring effect" which is what I'm going for.This creamy blend is in a tub that initially appears white until you blend it into your skin. Ethylene carbonate (sometimes abbreviated EC) is the organic compound with the formula (CH 2 O) 2 CO. It is a colourless, diamagnetic, amphoteric solid. Carbon makes up only about 0.025 percent of Earth's crust. This compound has been known since ancient times, and in nature, silica is found as quartz. Methane and carbon dioxide concentrations are increasing rapidly driving the Earths climate. Aluminium metal has an appearance ranging from silvery white to dull gray, depending on the surface roughness. Dimethicone is the main ingredient of the two-in-one shampoos. This powerhouse combo provides ultra long-term protection from the elements and relentless water beading, without sacrificing true optical clarity, extreme depth and that signature ceramic glass-like liquid-gloss appearance. Inactive Ingredients: colloidal silicon dioxide, compressible sugar, corn starch, magnesium stearate, microcrystalline cellulose and saccharin sodium. MnO 2 is also used as a pigment and as a Silicon nitride is a chemical compound of the elements silicon and nitrogen. Tin(IV) oxide, also known as stannic oxide, is the inorganic compound with the formula SnO 2.The mineral form of SnO 2 is called cassiterite, and this is the main ore of tin. Agrisilica delivers the highest PAS content of any bulk commercial 100% natural silicon fertiliser available today. We classified hypertrophic scar as a red or dark pink, raised (elevated) sometimes itchy scar confined within the border of the original surgical incision, with spontaneous regression after several months and a generally poor final appearance. Just spray on and wipe off, with this game-changing SiO2 (Silicon Dioxide) and TiO2 (Titanium Dioxide) blend. Methane and carbon dioxide concentrations are increasing rapidly driving the Earths climate. Articles report on outcomes research, prospective studies, and controlled trials of new endoscopic instruments and treatment methods. In many parts of the world, silica is the major constituent of sand.Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as a synthetic product. The appearance of scar, including scar type, scar size and scar color was assessed by the physician. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.It was discovered (along with krypton and xenon) in 1898 as one of the three residual rare inert elements remaining in dry air, after nitrogen, oxygen, argon and carbon Using remote sensing from space and the ground, we seek to quantify the underlying processes that drive these changes both their emissions and sinks. Gastrointestinal Endoscopy publishes original, peer-reviewed articles on endoscopic procedures used in the study, diagnosis, and treatment of digestive diseases. It is classified as the cyclic carbonate ester of ethylene glycol and carbonic acid.At room temperature (25 C) ethylene carbonate is a transparent crystalline solid, practically odorless and colorless, and somewhat soluble in water. Most KCN is used in gold mining, organic synthesis, and electroplating.Smaller applications include jewellery for chemical gilding and buffing.. Potassium cyanide is highly toxic.The moist solid emits small amounts of hydrogen There's no weird residual clumps that you get from the silicon based solutions, however you will get that "blurring effect" which is what I'm going for.This creamy blend is in a tub that initially appears white until you blend it into your skin. Chlorine dioxide is a chemical compound with the formula ClO 2 that exists as yellowish-green gas above 11 C, a reddish-brown liquid between 11 C and 59 C, and as bright orange crystals below 59 C. Lead(II,IV) oxide, also called red lead or minium, is the inorganic compound with the formula .A bright red or orange solid, it is used as pigment, in the manufacture of batteries, and rustproof primer paints.It is an example of a mixed valence compound, being composed of both Pb(II) and Pb(IV) in the ratio of two to one. This is why the sand at most of the world's beaches is quartz. Dimethicone is the most widely used silicone in hair care industry, and entropy is important for its adsorption to the hair surface. [citation needed] Aluminium metal has an appearance ranging from silvery white to dull gray, depending on the surface roughness. Agrisilica delivers the highest PAS content of any bulk commercial 100% natural silicon fertiliser available today. Silicon dioxide, also known as silica, is a chemical compound that is an oxide of silicon. Carbon monoxide has a computed fractional bond order of 2.6, indicating that the "third" bond is important but constitutes somewhat less than a full bond. Six locations were sampled directly during the crewed Apollo program landings from 1969 to 1972, which returned 380.96 kilograms (839.9 lb) of lunar rock and lunar soil to Earth. Plutonium dioxide is a stable ceramic material with an extremely low solubility in water and with a high melting point (2,744 C). MnO 2 is also used as a pigment and as a It is the most abundant mineral in Earth's crust and is resistant to both chemical and physical weathering. Silane is an inorganic compound with chemical formula, SiH 4.It is a colourless, pyrophoric, toxic gas with a sharp, repulsive smell, somewhat similar to that of acetic acid. It is found in the gas state at room temperature. It is a colourless, diamagnetic, amphoteric solid. Manganese dioxide is the inorganic compound with the formula MnO 2.This blackish or brown solid occurs naturally as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules.The principal use for MnO 2 is for dry-cell batteries, such as the alkaline battery and the zinccarbon battery. THE POLAR EXPRESS Cocoa Combo Our biggest Savings yet This combo comes with an Exclusive Blanket you cant even get in our gift shop, a matching 8oz Tumbler and a 7 Snowman Plush. Silicon nitride is a chemical compound of the elements silicon and nitrogen.
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