Helium Chemistry Research Paper

atomic number 2 (Greek helios, lie), type He, inert, colorless, odorless shove along element. In group 18 of the semestrial table, atomic number 2 is one of the fearful gases. The atomic number of atomic number 2 is 2.\n\nPierre Janssen notice atomic number 2 in the spectrum of the corona of the sun during an eclipse in 1868. briefly after it was identified as an element and named by the druggist Sir Edward Frankland and the British astronomer Sir Joseph Norman Lockyer. The gas was first unaffectionate from terrestrial sources in 1895 by the British chemist Sir William Ramsay, who discovered it in cleveite. In 1907 Sir Ernest Rutherford showed that of import pull up stakesicles are the nuclei of helium atoms.\n\nII PROPERTIES AND OCCURRENCE\n\nHelium has monoatomic molecules, and is the lightest of all gases except hydrogen. Helium solidifies at -272.2° C; helium boils at -268.9° C. The atomic tip of helium is 4.0026.\n\nHelium, like the separate noble gases, is ch emically inert. Its whizz electron shell is filled, reservation possible reactions with other elements passing touchy and the resulting compounds quite unstable. Molecules of compounds with neon, other noble gas, and with hydrogen take on been detected.\n\nHelium is the roughly difficult of all gases to liquefy and is impracticable to solidify at atmospherical pressure sensation. These properties make perspicuous helium extremely useful as a refrigerant and for observational work in producing and standard temperatures close to absolute zip. placid helium can be cooled almost to absolute zero at normal pressure by rapid removal of the vapor supra the liquid. At a temperature slightly above absolute zero, it is transformed into helium II, also called superfluid helium, a liquid with unique physical properties. It has no freezing point, and its viscosity is manifestly zero; it passes readily finished minute cracks. Helium-3, the lighter helium isotope, which has an eve n lower change state point than ordinary helium, exhibits contrasting properties when liquefied.\n\nHelium is the second most abundant element in the universe, after hydrogen; however, it is elevated on earth, primarily ground mixed with natural gas trapped in resistance 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 residuum of 5.4 parts per million. The proportion increases slightly at high altitudes. About 1 part per million of atmospheric helium consists of helium-3, now thought to be a product of the declination of tritium, a radioactive hydrogen...If you destiny to get a adequate essay, order it on our website:

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