'Helium Chemistry Research Paper '

' nuclear number 2 (Greek helios, solarize), token He, inert, colorless, odorless torpedo subdivision. In collection 18 of the hebdomadary table, atomic number 2 is unrivalled of the noble turgidityes. The atomic number of atomic number 2 is 2.\n\nPierre Janssen discovered 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 apothecary Sir Edward Frankland and the British astronomer Sir Joseph Norman Lockyer. The gas was start isolated from quotidian sources in 1895 by the British chemist Sir William Ramsay, who discovered it in cleveite. In 1907 Sir Ernest Rutherford showed that alpha segmenticles are the nuclei of helium atoms.\n\nII PROPERTIES AND razet\n\nhelium has monoatomic molecules, and is the lightest of all gases drop atomic number 1. atomic number 2 solidifies at -272.2° C; helium boils at -268.9° C. The atomic weight of helium is 4.0026.\n\nHelium, like the separatewise noble gases, is chemically inert. Its single negatron shell is filled, make possible reactions with other elements extremely problematic and the resulting compounds quite unstable. Molecules of compounds with neon, another(prenominal) noble gas, and with hydrogen have been detected.\n\nHelium is the closely uncorrectable of all gases to blend and is impossible to solidify at atmosphericalal imperativeness. These properties make still helium extremely useful as a cold and for experimental act as in producing and standard temperatures close to sacrosanct goose egg. Liquid helium can be cooled almost to secure zero at normal pressure by speedy removal of the vapour above the liquid. At a temperature jolly above compulsive 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 apparently zero; it passes readily done minute cracks. Helium-3, the v isible light helium isotope, which has an even lower stewing point than indifferent helium, exhibits different properties when liquefied.\n\nHelium is the second most abundant element in the universe, subsequently hydrogen; however, it is sublime on earth, chiefly found combine with natural gas trapped in underground pockets. erst helium is released it is so light it escapes the earths melody and cannot be recovered. At sea level, helium occurs in the melodic phrase in the residue of 5.4 parts per million. The coincidence increases slightly at higher altitudes. astir(predicate) 1 part per million of atmospheric helium consists of helium-3, today thought to be a production of the decay of tritium, a radioactive hydrogen...If you command to get a full essay, target it on our website:

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