Oxygen

``````````````````````````````````````````````````````````````````````````````````````````````````````````` Oxygen ( /??ks?d??n/ OK-si-jin) is the element with atomic stem 8 and represented by the symbol O. Its name derives from the Hellenic roots ???? (oxys) (acid, liter entirelyy sharp, referring to the sour evoke of acids) and -????? (-gen?s) ( recruitr, literally begetter), because at the time of naming, it was mistakenly musical theme that all acids required group O in their composition. At standard temperature and pressure, two atoms of the element bind to form ditype O, a colorless, odorless, tasteless diatomic gas with the formula O2. Oxygen is a member of the chalcogen group on the periodic table, and is a highly reactive nonmetallic element that readily forms compounds (notably oxides) with al come out all other elements. By the great unwashed, oxygen is the third round plentiful element in the universe after heat content and helium[1] and the most abunda nt element by mass in the humankinds crust, reservation up almost half of the crusts mass.[2] Free oxygen is also chemically reactive to appear on Earth without the photosynthetic action of breathing organisms, which use the energy of cheerfulness to produce elemental oxygen from water.

main(a) O2 only began to squirrel away in the atmosphere after the evolutionary appearance of these organisms, roughly 2.5 meg years ago.[3] Diatomic oxygen gas constitutes 20.8% of the brashness of air.[4] Because it comprises most of the mass in water, oxygen comprises most of the mass of living organisms (for example, about two-thirds of the human bodys mass). All major classes of geomorpholo gical molecules in living organisms, such as! proteins, carbohydrates, and fats, contain oxygen, as do the major inorganic compounds that comprise animal shells, teeth, and bone. Elemental oxygen is produced by cyanobacteria, algae and plants, and is used in cellular breathing for all complex life. Oxygen is toxic to obligately anaerobic organisms, which were the...If you urgency to get a full essay, order it on our website: OrderEssay.net

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