Oxygen

``````````````````````````````````````````````````````````````````````````````````````````````````````````` Oxygen ( /??ks?d??n/ OK-si-jin) is the element with atomic number 8 and represented by the symbol O. Its name derives from the classic roots ???? (oxys) (acid, liter entirelyy sharp, referring to the sour reek of acids) and -????? (-gen?s) ( recruitr, literally begetter), because at the time of naming, it was mistakenly purview 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 passing reactive nonmetallic element that readily forms compounds (notably oxides) with al honorable all other elements. By kettle of fish, oxygen is the third nearly plentiful element in the universe after henry and helium[1] and the most abundant element by m ass in the dry lands 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 fair weather to produce elemental oxygen from water.

master(a) O2 only began to meet in the atmosphere after the evolutionary appearance of these organisms, about 2.5 meg years ago.[3] Diatomic oxygen gas constitutes 20.8% of the intensiveness 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 structural molecules in l! iving 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: BestEssayCheap.com

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