, cherran, No Comment, June 25, 2016 Catherine of Aragon was born in the Archbishop’s Palace of Alcalá de Henares, near Madrid, on 15 or 16 December 1485, just four months after a Welshman by the name of Henry Tudor seized the English crown. A Short History of "The Eye of Argon" with Sandra Bond. So, it makes the filament to last longer and even prevents the glass of bulb from blackening. The noble gases are the six elements in Group 18 (VIIIA) of the periodic table. Given its inert qualities, it is used by museum conservators to protect old materials that are prone to gradual oxidation in air. Before 1962, the noble gases were considered to be entirely unable to form any compounds. It was the first noble gas to be discovered. , cherran, 2 Comments, The Difference Between Bolsheviks And Soviets, The Difference Between Creationism and Intelligent Design. History of Argon. As this gas is a poor conductor of heat, it is useful for thermal insulation in energy-efficient windows and for inflating scuba diving suits. L'argon o argo (dal greco ἀργός -όν "argòs -òn", significato: pigro) è l'elemento chimico della tavola periodica che ha come simbolo Ar e come numero atomico 18. It was isolated by examination of the residue obtained by removing nitrogen, oxygen, carbon dioxide, and water from clean air. The most exotic use of argon is in the tire of luxury cars. Nel 2002 è stato scoperto che l'argon, apparentemente inerte, come il kripton e lo xeno può formare un composto chimico con l'uranio. Between 1510 and 1518 Catherine gave birth to six children, including two sons, but all except Mary (later queen of England, 1553–58) either were stillborn or died in early infancy. History Argon (from the Greek word αργός , meaning "inactive") was suspected to be present in air by Henry Cavendish in 1785. This process also produces purified nitrogen, oxygen, neon, krypton, and xenon. There have been no adverse environmental consequences of argon. Argon is majorly used in incandescent lightning. The atom of each of these elements has a set of eight electrons (an "octet") in its outermost shell, which gives the atom stability and makes it resistant to bonding with other elements. Argon's name comes from the Greek word argos meaning lazy and indeed for more than a hundred years after its discovery chemists were unable to get it to combine with any other elements. Blue argon lasers are used in surgery to weld arteries, destroy tumors, and correct eye defects. Catherine appealed to Pope Clement VII, contending that her marriage to Henry was valid because the previous marriage to Arthur had never been consummated. Argon is the third most prevalent gas in the Earth's atmosphere, found at 9,300 parts per million. , cherran Argon is used to cool the heads of heat-seeking missiles. Create your own unique website with customizable templates. It is present in the Earth's atmosphere at slightly under one percent (by volume), making it the most common noble gas on Earth. July 3, 2015 , No Comment. The extreme inertness of argon and other noble gases is attributed to the electronic structure of their atoms. They were able to discover argon and other noble gases in year 1894. , Joan, 1 Comment, September 5, 2016 Each investigator observed new lines in the color spectrum of air, but they were unable to identify the element responsible for the lines. Important documents like the Declaration of Independence are stored in sealed, argon-filled glass cases to prevent decay. Read it and wibble. Fino al 1962 si riteneva che l'argon e gli altri gas nobili fossero chimicamente inerti ed incapaci di formare composti; nonostante la loro elevata inerzia, è stato però possibile forzarli a legarsi ad altri atomi. Our editors will review what you’ve submitted and determine whether to revise the article. This element can also form "clathrates" (cage-like molecules) with water, when its atoms are trapped in a lattice of water molecules. For some years the couple lived happily. Catherine was the youngest daughter of the Spanish rulers Ferdinand II of Aragon and Isabella I of Castile. Argon can be used to fill incadescent and flourescent light bulbs so that the oxygen doesn't destroy the filament. , Emily H, No Comment, June 30, 2016 Henry’s desire for a legitimate male heir prompted him in 1527 to appeal to Rome for an annulment on the grounds that the marriage had violated the biblical prohibition against a union between a man and his brother’s widow. By shining ultraviolet light onto frozen argon containing a small amount of hydrogen fluoride, argon hydrofluoride (HArF) was formed. It is situated between neon and krypton in group 18 (former group 8A), and is placed after chlorine in period three. Henry Cavendish proposed in 1785 that argon might exist. This article was most recently revised and updated by, Project Continua - Biography of Catherine of Aragon, Catherine of Aragon - Children's Encyclopedia (Ages 8-11), Catherine of Aragon - Student Encyclopedia (Ages 11 and up). Because of this, argon fluorohydride cannot be used for anything besides basic scientific research. The refusal of Pope Clement VII to annul Henry’s marriage to Catherine triggered the break between Henry and Rome and led to the English Reformation. Argon is also used in laser technology where the argon fluoride (ArF) excimer laser is used to LASIK or PRK surgeries that rectify vision. The noble gases are sometimes called inert gases because Group … It is inert under most conditions and forms no confirmed stable compounds at room temperature. Hartley. The most common form of argon is an isotope of argon-40 which results from the radioactive decay of potassium-40. Argon was discovered in 1894 by Scottish chemist Sir William Ramsay and Lord Raleigh, an English chemist.
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