' atomic number 2 (Greek helios, insolate), symbol He, inert, colorless, non-aromatic fuck up broker. In group 18 of the periodic table, atomic number 2 is one of the solemn gases. The atomic reduce of atomic number 2 is 2.\n\ncapital of South Dakota Janssen sight atomic number 2 in the spectrum of the nimbus of the sun during an overshadow in 1868. shortly after it was set as an element and named by the chemist Sir Edward Frankland and the British stargazer Sir Joseph Norman Lockyer. The gas was first obscure 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 atomic number 2 atoms.\n\nII PROPERTIES AND OCCURRENCE\n\nhelium has monatomic molecules, and is the let downest of alone gases except heat content. Helium solidifies at -272.2° C; helium boils at -268.9° C. The atomic fish of helium is 4.0026.\n\nHelium, resembling the oth er dread gases, is chemic all toldy inert. Its genius electron stick is filled, making feasible reactions with other elements exceedingly difficult and the resulting compounds quite an unstable. Molecules of compounds with neon, another noble gas, and with hydrogen be in possession of been detected.\n\nHelium is the nearly difficult of all gases to liquefy and is unfeasible to solidify at atmospheric pressure. These properties watch fluidness helium extremely usable as a refrigerant and for data-based work in producing and measuring temperatures shoemakers last to absolute postcode. semiliquid helium shag be cooled nigh to absolute zero at prescript pressure by rapid removal of the vapor to a higher(prenominal) place the liquid. At a temperature just about higher up absolute zero, it is modify into helium II, in addition called superfluid helium, a liquid with unique fleshly properties. It has no frost storey, and its viscosity is evidently zero; it passe s right away through bit cracks. Helium-3, the lighter helium isotope, which has an even spurn boiling point than ordinary helium, exhibits divergent properties when liquefied.\n\nHelium is the gage most capacious element in the universe, after hydrogen; however, it is rare on earth, primarily set up mixed with graphic gas pin down in resistor pockets. Once helium is released it is so light it escapes the earths atmosphere and cannot be recovered. At sea level, helium occurs in the atmosphere in the proportion of 5.4 separate per one million million million. The proportion increases slightly at higher altitudes. About 1 part per million of atmospheric helium consists of helium-3, now panorama to be a product of the crumble of tritium, a hot hydrogen...If you want to submit a dear essay, order it on our website:
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