Piper,+Noah

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v Name- helium Symbol-he Boiling point—452.1 degrees Fahrenheit Melting point-458 degrees Fahrenheit Density-214 kg m-3 Number of protons neutrons and electrons-2neutrons 2 protons 2 electrons Atomic mass-4.002602 Atomic number-2 Electron configuration and electron notation- 1s2, 2 in the first level Number of valence electrons-2 How when and who discovered- 1868 discovered by pierre janssen who detected a yellow line in the solar spectrum which was the helium Where and how produced processed or mined- can get it by treating clevite Chemical and physical properties-Colorless, non metallic no smell Minerals compounds and ores in which found- clevite Two common chemical reactions- none I8ndustrial and commercial use- cooling medium for Nuclear reactors, used in balloons, and a pressurizer For fuels for rocketscost or value- 20 dollars for 9 cubic feet Diagram of bohr model- up above Picture of element at pure state- up above Unusual facts- most of the worlds helium is in texas And it the twentieth most abundant element in the world //webelements.com//. Mark Winter, n.d. Web. 11 Dec. 2012. []. //wikipedia.com//. N.p., n.d. Web. 11 Dec. 2012. []. //answers.com//. N.p., n.d. Web. 2 Dec. 2012. [].