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US Department of Labor The Office of Workers Compensation Programs administers four major disability compensation programs which provide wage replacement benefits. Free Program Air Force Banded Pt Program' title='Free Program Air Force Banded Pt Program' />Methods. We conducted a randomized, controlled trial to examine the effects of two behavioral weightloss interventions in 415 obese patients with at least one. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. Easily share your publications and get. By Miya Jones Twitter miyajones1996 Instsgram sweetmjones SZAs debut album, Ctrl, was a great success, gaining several positive reviews and shoutouts. Sports Apparel, Jerseys and Fan Gear at Fanatics. Oxygen Wikipedia. Oxygen,  8. OLiquid oxygen boiling. General properties. Pronunciation. OK sij n. Allotropes. O2, O3 OzoneAppearancegas colorlessliquid pale blue. Air Force Falcons Alabama Crimson Tide Arizona State Sun Devils Arizona Wildcats Arkansas Razorbacks Army Black Knights Auburn Tigers Baylor Bears Boise State Broncos. Standard atomic weightAr, standard7. Oxygen in the periodic table. Atomic numberZ8. Group, periodgroup 1. Blockp block. Element category diatomic nonmetal. Electron configurationHe 2s. Electrons per shell. Physical properties. Phaseat STPgas. Melting point. K 2. 18. 7. 9 C, 3. FBoiling point. 90. K 1. 82. 9. 62 C, 2. FDensityat STP1. Lwhen liquid at b. Triple point. 54. K, 0. 1. 46. 3 k. Pa. Critical point. K, 5. 0. 43 MPa. Heat of fusionO2 0. Jmol. Heat of vaporizationO2 6. Jmol. Molar heat capacityO2 2. JmolKVapor pressure. P Pa1. 10. 10. 01 k. T K   6. 17. 39. Atomic properties. Oxidation states. Electronegativity. Pauling scale 3. Ionization energies. Jmol. 2nd 3. 38. Jmol. JmolmoreCovalent radius. Van der Waals radius. Miscellanea. Crystal structurecubic. Speed of sound. 33. CThermal conductivity. WmKMagnetic orderingparamagnetic. Magnetic susceptibility3. K2CAS Number. 77. History. Discovery. Carl Wilhelm Scheele1. Named by. Antoine Lavoisier1. Main isotopes of oxygen. Wikidata. Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogengroup on the periodic table, a highly reactivenonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. By mass, oxygen is the third most abundant element in the universe, after hydrogen and helium. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomicgas with the formula O2. Diatomic oxygen gas constitutes 2. Earths atmosphere. As compounds including oxides, the element makes up almost half of the Earths crust. Dioxygen is used in cellular respiration and many major classes of organic molecules in living organisms contain oxygen, such as proteins, nucleic acids, carbohydrates, and fats, as do the major constituent inorganic compounds of animal shells, teeth, and bone. Most of the mass of living organisms is oxygen as a component of water, the major constituent of lifeforms. Oxygen is continuously replenished by photosynthesis, which uses the energy of sunlight to produce oxygen from water and carbon dioxide. Oxygen is too chemically reactive to remain a free element in air without being continuously replenished by the photosynthetic action of living organisms. Another form allotrope of oxygen, ozone O3, strongly absorbs ultraviolet UVB radiation and the high altitude ozone layer helps protect the biosphere from ultraviolet radiation. But ozone is a pollutant near the surface where it is a by product of smog. Oxygen was discovered independently by Carl Wilhelm Scheele, in Uppsala, in 1. Joseph Priestley in Wiltshire, in 1. Priestley is often given priority because his work was published first. The name oxygen was coined in 1. Antoine Lavoisier, whose experiments with oxygen helped to discredit the then popular phlogiston theory of combustion and corrosion. Its name derives from the Greek roots oxys, acid, literally sharp, referring to the sour taste of acids and genes, producer, literally begetter, because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition. Tilapia Biology Culture And Nutrition Pdf. Common uses of oxygen include residential heating, internal combustion engines, production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight and diving. History. Early experiments. One of the first known experiments on the relationship between combustion and air was conducted by the 2nd century BCE Greek writer on mechanics, Philo of Byzantium. In his work Pneumatica, Philo observed that inverting a vessel over a burning candle and surrounding the vessels neck with water resulted in some water rising into the neck. Philo incorrectly surmised that parts of the air in the vessel were converted into the classical elementfire and thus were able to escape through pores in the glass. Many centuries later Leonardo da Vinci built on Philos work by observing that a portion of air is consumed during combustion and respiration. In the late 1. Robert Boyle proved that air is necessary for combustion. English chemist John Mayow 1. In one experiment, he found that placing either a mouse or a lit candle in a closed container over water caused the water to rise and replace one fourteenth of the airs volume before extinguishing the subjects. From this he surmised that nitroaereus is consumed in both respiration and combustion. Mayow observed that antimony increased in weight when heated, and inferred that the nitroaereus must have combined with it. He also thought that the lungs separate nitroaereus from air and pass it into the blood and that animal heat and muscle movement result from the reaction of nitroaereus with certain substances in the body. Accounts of these and other experiments and ideas were published in 1. Tractatus duo in the tract De respiratione. Phlogiston theory. Robert Hooke, Ole Borch, Mikhail Lomonosov, and Pierre Bayen all produced oxygen in experiments in the 1. This may have been in part due to the prevalence of the philosophy of combustion and corrosion called the phlogiston theory, which was then the favored explanation of those processes. Pc Game Empire Earth 3 Iso. Established in 1. German alchemist J. J. Becher, and modified by the chemist Georg Ernst Stahl by 1. One part, called phlogiston, was given off when the substance containing it was burned, while the dephlogisticated part was thought to be its true form, or calx. Highly combustible materials that leave little residue, such as wood or coal, were thought to be made mostly of phlogiston non combustible substances that corrode, such as iron, contained very little. Air did not play a role in phlogiston theory, nor were any initial quantitative experiments conducted to test the idea instead, it was based on observations of what happens when something burns, that most common objects appear to become lighter and seem to lose something in the process. Discovery. Oxygen was first discovered by Swedish pharmacist Carl Wilhelm Scheele. He had produced oxygen gas by heating mercuric oxide and various nitrates in 1. Scheele called the gas fire air because it was the only known supporter of combustion, and wrote an account of this discovery in a manuscript he titled Treatise on Air and Fire, which he sent to his publisher in 1. That document was published in 1. In the meantime, on August 1, 1. British clergyman Joseph Priestley focused sunlight on mercuric oxide Hg. O inside a glass tube, which liberated a gas he named dephlogisticated air. He noted that candles burned brighter in the gas and that a mouse was more active and lived longer while breathing it. After breathing the gas himself, he wrote The feeling of it to my lungs was not sensibly different from that of common air, but I fancied that my breast felt peculiarly light and easy for some time afterwards. Priestley published his findings in 1. An Account of Further Discoveries in Air which was included in the second volume of his book titled Experiments and Observations on Different Kinds of Air. Because he published his findings first, Priestley is usually given priority in the discovery.