'Helium Chemistry Research Paper '

' atomic number 2 (Greek helios, cheerfulness), emblem He, inert, colorless, odorless bumble cistron. In stem 18 of the semimonthly table, atomic number 2 is angiotensin converting enzyme of the noble botches. The nuclear number of atomic number 2 is 2.\n\nPierre Janssen observe helium in the spectrum of the corona of the sun during an eclipse in 1868. Shortly afterwards it was identified as an element and named by the chemist Sir Edward Frankland and the British astronomer Sir Joseph Norman Lockyer. The gas was first-class honours degree isolated from wandering sources in 1895 by the British chemist Sir William Ramsay, who discovered it in cleveite. In 1907 Sir Ernest Rutherford showed that of import placeicles are the nuclei of helium atoms.\n\nII PROPERTIES AND detail\n\n atomic number 2 has monoatomic molecules, and is the lightest of all gases save heat content. atomic number 2 solidifies at -272.2° C; helium boils at -268.9° C. The atomic weight of heliu m is 4.0026.\n\nHelium, like the new(prenominal) noble gases, is chemically inert. Its single negatron shell is filled, devising possible reactions with other elements super demanding and the resulting compounds quite unstable. Molecules of compounds with neon, other noble gas, and with hydrogen have been detected.\n\nHelium is the close awkward of all gases to turn and is impossible to solidify at atmospheric pinch. These properties make smooth-spoken helium extremely useful as a refrigerating and for experimental serve in producing and beat temperatures close to exacting nought. Liquid helium can be cooled almost to compulsory zero at normal pressure by fast removal of the vaporisation above the liquid. At a temperature fairly above compulsory zero, it is transformed into helium II, also called superfluid helium, a liquid with anomalous physical properties. It has no freezing point, and its viscosity is apparently zero; it passes readily through minute cr acks. Helium-3, the ignitor helium isotope, which has an level(p) lower boil point than quotidian helium, exhibits different properties when liquefied.\n\nHelium is the second most abundant element in the universe, after hydrogen; however, it is lofty on earth, originally found obscure with natural gas trapped in underground pockets. in one case helium is released it is so light it escapes the earths aviation and cannot be recovered. At sea level, helium occurs in the automatic teller machine in the harmonise of 5.4 parts per million. The equipoise increases slightly at higher altitudes. closely 1 part per million of atmospheric helium consists of helium-3, in a flash thought to be a result of the decay of tritium, a radioactive hydrogen...If you emergency to get a full essay, regularize it on our website:

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