'Helium Chemistry Research Paper '

' atomic number 2 (Greek helios, sun), attribute He, inert, colorless, odorless bodge grammatical constituent. In mathematical group 18 of the day- subsequently-day table, atomic number 2 is virtuoso of the noble gasconadees. The atomic 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 aft(prenominal) 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 commencement ceremony isolated from planetal sources in 1895 by the British chemist Sir William Ramsay, who discovered it in cleveite. In 1907 Sir Ernest Rutherford showed that of import classicles are the nuclei of helium atoms.\n\nII PROPERTIES AND occurrence\n\n atomic number 2 has monoatomic molecules, and is the lightest of all gases get out hydrogen. helium solidifies at -272.2° C; helium boils at -268.9° C. The atomic weight of helium is 4.0026.\n\nHelium, like the some former(a) noble gases, is chemically inert. Its single negatron shell is filled, reservation possible reactions with other elements exceedingly touchy and the resulting compounds quite unstable. Molecules of compounds with neon, other noble gas, and with hydrogen have been detected.\n\nHelium is the most(prenominal) tricky of all gases to sell up and is impossible to change integrity at atmospherical insisting. These properties make fluent helium extremely useful as a cold and for experimental hammer in producing and amount temperatures close to unequivocal cipher. Liquid helium can be cooled almost to despotic zero at normal pressure by fast removal of the vapor above the liquid. At a temperature fairly above strong zero, it is transformed into helium II, also called superfluid helium, a liquid with unequalled physical properties. It has no freezing point, and its viscousness is apparently zero; it passes readily by minute cracks. Helium-3, the visible light helium isotope, which has an redden lower turn point than intermediate helium, exhibits different properties when liquefied.\n\nHelium is the second most abundant element in the universe, after hydrogen; however, it is ancient on earth, to begin with found coalesce with natural gas trapped in underground pockets. at a time helium is released it is so light it escapes the earths aviation and cannot be recovered. At sea level, helium occurs in the zephyr in the balance wheel of 5.4 parts per million. The attribute increases slightly at higher altitudes. rough 1 part per million of atmospheric helium consists of helium-3, straight off thought to be a crop of the decay of tritium, a radioactive hydrogen...If you fate to get a full essay, set up it on our website:

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