Helium Chemistry Research Paper

atomic number 2 (Greek helios, fair weather), symbol He, inert, colorless, odorless foul up element. In group 18 of the oscillatory table, atomic number 2 is one of the stately gases. The atomic number of atomic number 2 is 2.\n\nPierre Janssen observe atomic number 2 in the spectrum of the corona of the sun during an eclipse in 1868. concisely after it was identified as an element and named by the pill pusher 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 important classifyicles are the nuclei of helium atoms.\n\nII PROPERTIES AND OCCURRENCE\n\nHelium has monatomic molecules, and is the lightest of all gases except hydrogen. Helium solidifies at -272.2° C; helium boils at -268.9° C. The atomic cant of helium is 4.0026.\n\nHelium, like the new(prenominal) noble gases, i s chemically inert. Its maven electron shell is filled, reservation possible reactions with other elements passing trying and the resulting compounds quite unstable. Molecules of compounds with neon, another(prenominal) noble gas, and with hydrogen obtain been detected.\n\nHelium is the close to difficult of all gases to liquefy and is unattainable to solidify at atmospherical squash. These properties make unstable helium extremely useful as a refrigerant and for observational work in producing and bar temperatures close to absolute adjust. fluid helium can be cooled almost to absolute zero at normal pressure by rapid removal of the vapor to a higher(prenominal) place 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 ostensibly zero; it passes readily through and through minute cracks. Helium-3, the lighter helium isotope, which has an even lower turn point than ordinary helium, exhibits varied properties when liquefied.\n\nHelium is the second most abundant element in the universe, after hydrogen; however, it is obsolete on earth, primarily tack mixed with natural gas trapped in hush-hush pockets.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 counterpoise of 5.4 parts per million. The proportion increases slightly at higher altitudes. About 1 part per million of atmospheric helium consists of helium-3, now thought to be a product of the disintegrate of tritium, a radioactive hydrogen...If you trust to get a profuse essay, order it on our website:

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