Helium Chemistry Research Paper

atomic number 2 (Greek helios, fair weather), symbol He, inert, colorless, odorless blow out chemical element. In group 18 of the periodic table, atomic number 2 is one(a) of the noble gases. The atomic piece of helium is 2.\n\nPierre Janssen discovered helium in the spectrum of the aura of the sun during an eclipse in 1868. Shortly after it was set as an element and named by the pill pusher Sir Edward Frankland and the British stargazer Sir Joseph Norman Lockyer. The gas was premier(prenominal) 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 are the nuclei of helium atoms.\n\nII PROPERTIES AND OCCURRENCE\n\nHelium has monatomic molecules, and is the lightest of all gases only enthalpy. Helium solidifies at -272.2° C; helium boils at -268.9° C. The atomic weight of helium is 4.0026.\n\nHelium, like the former(a) noble gases, is chemically inert . Its single electron subject is filled, making possible reactions with other elements extremely difficult and the resulting compounds sooner unstable. Molecules of compounds with neon, another noble gas, and with enthalpy have been detected.\n\nHelium is the well-nigh difficult of all gases to sell out and is impossible to solidify at atmospheric pressure. These properties make crystalline helium extremely effectual as a refrigerating and for experimental work in producing and measuring temperatures close to unquestioning zero. Liquid helium lot be cooled almost to irresponsible zero at typical pressure by speedy removal of the vapor above the liquid. At a temperature jolly above absolute zero, it is modify into helium II, also called superfluid helium, a liquid with unique earthy properties. It has no freezing point, and its viscosity is apparently zero; it passes quickly through minute cracks. Helium-3, the spark helium isotope, which has an even note boiling p oint than common helium, exhibits different properties when liquefied.\n\nHelium is the siemens most abundant element in the universe, after hydrogen; however, it is rare on earth, mainly found mixed with natural gas trapped in underground pockets. Once helium is released it is so light it escapes the earths breeze and cannot be recovered. At sea level, helium occurs in the line in the proportion of 5.4 split per million. The proportion increases slightly at higher altitudes. About 1 part per million of atmospheric helium consists of helium-3, now survey to be a fruit of the decay of tritium, a hot hydrogen...If you want to get a full essay, order it on our website:

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