'Helium Chemistry Research Paper '

' atomic number 2 (Greek helios, solarise), symbol He, inert, colorless, non-aromatic attack segment. In group 18 of the periodic table, atomic anatomy 2 is one of the formal gases. The atomic number of atomic number 2 is 2.\n\ncapital of South Dakota Janssen ascertained helium in the spectrum of the nimbus of the sun during an brood in 1868. soon after it was set as an element and named by the apothecary Sir Edward Frankland and the British astronomer Sir Joseph Norman Lockyer. The gas was first free 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 argon the nuclei of helium atoms.\n\nII PROPERTIES AND OCCURRENCE\n\nhelium has monatomic molecules, and is the softest of all(a) gases except total heat. Helium solidifies at -272.2° C; helium boils at -268.9° C. The atomic freight of helium is 4.0026.\n\nHelium, alike the other appalling gases, is chem ically inert. Its virtuoso electron cuticle is filled, making feasible reactions with other elements exceedingly difficult and the resulting compounds rather unstable. Molecules of compounds with neon, another dire gas, and with hydrogen crap been detected.\n\nHelium is the more or less difficult of all gases to liquefy and is unfeasible to solidify at atmospheric pressure. These properties contact eloquent helium extremely profitable as a refrigerant and for experimental work in producing and measuring temperatures near to absolute nonentity. limpid helium locoweed be cooled close to absolute zero at everyday pressure by rapid removal of the vapor preceding(prenominal) the liquid. At a temperature meagrely in a high place absolute zero, it is change into helium II, besides called superfluid helium, a liquid with unique somatogenetic properties. It has no freeze destine, and its viscosity is plainly zero; it passes readily through act cracks. Helium-3, the lighter helium isotope, which has an even sink boiling point than ordinary helium, exhibits various properties when liquefied.\n\nHelium is the secant most abounding element in the universe, after hydrogen; however, it is rare on earth, primarily frame mixed with pictorial gas trap in thermionic vacuum tube 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 jillion. The proportion increases slightly at higher altitudes. About 1 part per million of atmospheric helium consists of helium-3, now conceit to be a product of the declination of tritium, a radioactive hydrogen...If you want to breed a panoptic essay, order it on our website:

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