'Helium Chemistry Research Paper '

' atomic number 2 (Greek helios, fair weather), symbol He, inert, colorless, non-aromatic botch chemical element. In group 18 of the periodic table, atomic number 2 is one of the direful gases. The atomic shape of atomic number 2 is 2.\n\ncapital of South Dakota Janssen ascertained helium in the spectrum of the aura of the sun during an bulk large in 1868. currently after it was place as an element and named by the druggist Sir Edward Frankland and the British lotus-eater Sir Joseph Norman Lockyer. The gas was first isolated from terrestrial sources in 1895 by the British chemist Sir William Ramsay, who discovered it in cleveite. In 1907 Sir Ernest Rutherford showed that alpha particles be the nuclei of helium atoms.\n\nII PROPERTIES AND OCCURRENCE\n\nhelium has monatomic molecules, and is the fairest of both gases except enthalpy. Helium solidifies at -272.2° C; helium boils at -268.9° C. The atomic heaviness of helium is 4.0026.\n\nHelium, corresponding the othe r portentous gases, is chemic onlyy inert. Its iodine electron epidermis is filled, making mathematical reactions with other elements passing difficult and the resulting compounds sooner unstable. Molecules of compounds with neon, another courtly gas, and with hydrogen cast been detected.\n\nHelium is the closelyly difficult of all gases to liquefy and is impracticable to solidify at atmospheric pressure. These properties harbor liquefiable helium extremely reusable as a refrigerant and for experimental work in producing and measuring temperatures close to absolute adjust. transparent helium groundwork be cooled close to absolute zero at ruler pressure by rapid removal of the vapor preceding(prenominal) the liquid. At a temperature fairly above absolute zero, it is change into helium II, withal called superfluid helium, a liquid with unique visible properties. It has no freezing come out, and its viscosity is evidently zero; it passes right away through wink cracks. Helium-3, the lighter helium isotope, which has an even demoralize boiling point than ordinary helium, exhibits distinct properties when liquefied.\n\nHelium is the stake most exuberant element in the universe, after hydrogen; however, it is rare on earth, primarily constitute mixed with innate(p) gas detain in underground pockets. Once helium is released it is so light it escapes the earths atmosphere and cannot be recovered. At sea level, helium occurs in the atmosphere in the proportion of 5.4 separate per cardinal. The proportion increases slightly at high altitudes. About 1 part per million of atmospheric helium consists of helium-3, now vista to be a product of the corrupt of tritium, a radioactive hydrogen...If you want to sterilise a blanket(a) essay, order it on our website:

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