Helium

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Title: Helium

Essay Details:

Subject: Science

Author: Thomas G

Date: June 21, 2014

Level: University

Grade: A

Length: 3 / 683

Essay text:

In 1907 Sir Ernest Rutherford showed that alpha particles are the nuclei of helium atoms. II PROPERTIES AND OCCURRENCE Helium has monatomic molecules, and is the lightest of all gases except hydrogen. Helium solidifies at -272.2° C; helium boils at -268.9° C. The atomic weight of helium is 4.0026. Helium, like the other noble gases, is chemically inert. Its single electron shell is filled, making possible reactions with other elements extremely difficult and the resulting compounds quite unstable. Molecules of compounds with neon, another noble gas, and with hydrogen have been detected. Helium is the most difficult of all gases to liquefy and is impossible to solidify at atmospheric pressure...

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