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Essay

Helium

Essay specific features

 

Issue:

Science

 

Written by:

Gail C

 

Date added:

December 15, 2010

 

Level:

University

 

Grade:

A

 

No of pages / words:

3 / 683

 

Was viewed:

3958 times

 

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Essay content:

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...
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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...
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