Helium

helium Helium (Greek helios," cheer"), symbol He, inert, colorless, odorless gasoline element. In group 18 of the periodic table, helium is title-holder of the noble gases. The nuclear upshot of helium is 2. Pierre Janssen get word helium in the spectrum of the glory of the sun during an eclipse in 1868. Shortly after it was determine as an element and named by the pharmacist Sir Edward Frankland and the British lotus-eater Sir Joseph Norman Lockyer. The gas was beginning isolated from terrestrial sources in 1895 by the British apothecary Sir William Ramsay, who discovered it in cleveite. In 1907 Sir Ernest Rutherford showed that alpha particles are the nuclei of helium atoms.

II PROPERTIES AND OCCURRENCE Helium has monnuclear molecules, and is the lightest of all gases disregard hydrogen. Helium solidifies at -272.2° C; helium boils at -268.9° C. The atomic weight of helium is 4.0026. Helium, same the other noble gases, is chemically inert. Its single electron face is filled, maki...If you want to get a full essay, order it on our website: Ordercustompaper.com

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