Search Results - Chemical element
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A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus. The term is also used to refer to a pure chemical substance composed of atoms with the same number of protons. [1] Common examples of elements are iron, copper, silver, gold, hydrogen, carbon, nitrogen, and oxygen. In total, 117 elements have been observed as of 2008, of which 94 occur naturally on Earth. 80 elements have stable isotopes, namely all elements with atomic numbers 1 to 82, except elements 43 and 61 ( technetium and promethium). Elements with atomic numbers 83 or higher ( bismuth and above) are inherently unstable, and undergo radioactive decay. The elements from atomic number 83 to 94 have no stable nuclei, but are nevertheless found in nature, either surviving as remnants of the primordial stellar nucleosynthesis that produced the elements in the solar system, or else produced as short-lived daughter-isotopes through the natural decay of uranium and thorium. [2]All chemical matter consists of these elements. New elements of higher atomic number are discovered from time to time, as products of artificial nuclear reactions. Several old philosophies used a set of archetypal classical elements to explain patterns in nature. The term 'element' was originally used to refer to a state of matter (solid/earth, liquid/water, gas/air, and plasma/fire) or a phase of matter (as in the Chinese Wu Xing), rather than the chemical elements of modern science. The Greek, Indian (Tattva and Mahabhuta) and Japanese (go dai) traditions essentially had the same five elements Air, Earth, Fire, Water and Aether. The term 'elements' (stoicheia) was first used by the Greek philosopher Plato in about 360 BCE, in his dialogue Timaeus, which includes a discussion of the composition of inorganic and organic bodies and is a rudimentary treatise on chemistry. Plato assumed that the minute particle of each element corresponded to one of the regular polyhedra tetrahedron (fire), octahedron (air), icosahedron (water), and cube (earth).[citation needed][3]
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Showing 1 to 14 of 14 Articles matching 'Chemical element' in related articles. |
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1. Hazmat Shipping Precautions
November 16, 2009
All cross country shipping requires expertise, training and safety. Nowhere is this more apparent than when hazardous materials are involved. Hazardous materials include any biological, chemical, radioactive, poisonous, combustible or any other type of element that can cause harm to animals and humans. For this reason these items must be shipped safely in order to not cause damage to people or property. When an accident occurs, hazmat teams must be contacted in order to dispose of the agents causing the problem. There are many safe ways to ship hazardous materials to their specified destina... (read more)
Author: Angela Entzminger
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2. How Chrome Accessories Are Made
October 16, 2009
"Chrome" is a common abbreviation for the natural chemical element chromium. It is a hard metal that is resistant to corrosion, and is used as one of the components to make stainless steel.
Despite its strength as a metal, materials are seldom made from solid chrome. When something is referred to as being chrome it usually means it is simply plated in a thin layer of the material.
The purpose of plating something in chrome can be practical (to protect it from nicks or rust) or decorative (to add a shiny or flashy appearance). Chrome is popular for both purposes in auto, motorcycle ... (read more)
Author: Allison Savage
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3. Information about Air Filters
October 16, 2009
Ceramic filters are frequently connected with the water filtration process. However, these elements are used in a multitude of different verticals and in a couple verticals are a required protectant from harmful, negative gases moving into the worlds sky.
These ceramic hot air filters are made to work at heat up to one thousand degrees and are purchasable in a multitude element sizes. Also, all filtration processes take place during chemical processes due to their efficiency.
The benefit of taking solids at large temperatures include the reasoning that the emissions involved is alrea... (read more)
Author: Anthony Davidson
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4. Oxygen an Element of Usefulness and Danger
September 13, 2009
Oxygen is a colorless, odorless gas. It is the most abundant chemical element found in air, sea and land. The gas form of oxygen is used by humans to breath, and can also be used for welding and cutting. When oxygen is used for welding it is mixed with acetylene, propylene or propane to provide the high temperatures needed for welding and cutting. Oxygen is an accelerant and will cause anything flammable to burn hotter and faster. For example a man was working in a welding shop he had just finished a project and was going to take a smoke break. His clothes had picked up a lot of dus... (read more)
Author: Amylena Olson
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5. The Environmentally Friendly Lawn
September 11, 2009
Most lawns are far from being an environmentally responsible element of a landscape. Their constant demand of water, dependence on chemical fertilizers, and need for insecticides and herbicides, makes them more of an environmental casualty than anything else. And what's so wrong with this is that, once established, an eco-friendly lawn actually takes less work and resources to keep looking beautiful than traditionally kept yards.
Of all the elements responsible, the majority of what is responsible for creating an ecologically friendly green lawn lies in the soil. As with all plants, An ... (read more)
Author: Steve Boulden
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6. Metal Filter Information
September 11, 2009
Metal filters, also referred to as elements, are often utilized for the removal of harsh, hard contaminants. These include but are not contained to plastic extrusion, cutting oil, lube oil, hydraulic oil, fuel, and solvents. Micron ratings normally range from 5-750 micron.
A style element is a normal option on crimped end or welded configurations and gives function to the filter to lose the need of adhesives in the filter. Adhesive free cartridges can similarly be used in strong chemical or intense high temperature situations that can’t be refrained by the temperature rating or compatibi... (read more)
Author: Ross Hudgens
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7. Prostate Cancer - Is Selenium Like Placebo ?
August 18, 2009
Selenium is a powerful antioxidant which researchers have discovered to be mostly effective in supporting healthy prostate performance . According to a federally subsidized inquiry, available by a Stanford University urologist, adult male with abnormally small levels of Selenium in their blood have four to five times more likely to develop prostate cancer. Selenium is a chemical element that is supplied in certain foods and supplements.
The report suggests that making a custom of consuming Selenium-rich foods, such as Brazil nuts as well as tuna, or taking a Selenium add-on, may as... (read more)
Author: Heinz Golz
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8. Metal-Titanium Recycling- Basic Information.
August 07, 2009
Basic Information(Ti): Titanium is a chemical element with the symbol Ti and atomic number 22. Sometimes called the “space age metal”, it has a low density and is a strong, lustrous, corrosion-resistant (including to sea water, aqua regia and chlorine) transition metal with a silver color. Extraction of Titanium(Ti) Even if the present extraction of titanium by the Kroll Processisrelatively energy intensive as compared to other manufacturing metals, the energy and waste savings achieved by the use of titanium represent a payback not available from less corrosion resistant, heavier, less str... (read more)
Author: mma metal
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9. Metal- Zirconiume Basic Information & Uses
August 07, 2009
Zirconium is a chemical element. Zirconium is a lustrous,gray-white, , strong transition metal that resembles titanium. Zirconium is used as an alloying agent due to its high resistance to corrosion. It is never found as a native metal; it is obtained mainly from the mineral zircon, which can be purified by chlorine. Zirconium has no known biological role. Zirconium forms both inorganic and organometallic compounds such as zirconium dioxide and zirconocene dichloride, respectively. There are five naturally-occurring isotopes, three of which are stable. Short-term exposure to zirconium powder ... (read more)
Author: mma metal
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10. what soever
July 21, 2009
or so basic principle to swear chemical element For SEO Optimizing letter of the alphabet position for hunting engines hire real helper to condiment banquet knowing of your business concern OR modify metal Indiana income OR enquiries. PS, look this site that i found, It's about ranking in google and it is in spanish : posicionamiento en google Try it. . Depending off the social event contention for doomed hunting position price you determine bequeath obviate want to mark all all improvement compartment boxful OR sporting or so of them. If on that point is letter of the alphabet... (read more)
Author: Anderson Wyatt
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11. Tungsten: A wedding Special
June 30, 2009
Weddings are ceremonies that unite people in marriage. With weddings, a couple is held together in holy union as the blessings of the all powerful is endowed upon them.
Weddings are made special by flowers, grand entourage and other symbolic items which are especially tailored to add color and spice to the occasion. Like any other symbolic items in a wedding, couples can never do away with unity bands. Nowadays, the best unity rings are tungsten wedding bands. Tungsten is a chemical element characterized with hardness even in high temperatures. This element is ideal in making tungsten wed... (read more)
Author: Christopher Thomson
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12. Wedding Specials
June 30, 2009
Wedding bands made out different materials thrive in the jewelry market today. In your desire to have the best wedding specials, it is but wise for you to know the components of the jewels you will purchase for the bride. Nowadays, what is prominent in the ring world are those made out of tungsten as they have been rated as classy and lasting. Before you do decide to purchase tungsten wedding rings, it will be good for you to know the perks and setbacks of the material.
Tungsten is a chemical element widely known for its industrial benefits. Its durability and hardness have made it perfec... (read more)
Author: Christopher Thomson
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13. Various Types of Nickel Based Alloys
June 22, 2009
An alloy is simply a metal made from more than one element. There is variety of alloys and each alloy has its own specific chemical and mechanical properties. The alloys made finished products have certain properties that pure metal does not contain. By combining these metals, one can achieve the better substance through certain procedures. The Aluminium, stainless steel, titanium, copper and nickel based alloys are commonly used in different industries.
The below given various nickel alloys are used in different applications depending on their resistance ability at elevated temperatures... (read more)
Author: Marsh Shaun
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14. Buy Resveratrol: The Natural Wonder Drug
April 21, 2009
Resveratrol is an especial natural element which can boast of a wide array of therapeutic qualities. If you are wondering ?What is Resveratrol?? then you need not be flabbergasted any more. Resveratrol is a natural chemical which is produced by various plants when they are under attack by pathogens such as fungi or bacteria.
Resveratrol in its common form is found in red wine and red grapes, pine nuts and peanuts. There are several benefits of Resveratrol but the quintessential one includes its antioxidant qualities. The antioxidants present in Resveratrol fight with the harmful free ... (read more)
Author: Robert Bell
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