Rupert,+Robert

Helium = = Helium, He

Atomic Number: 2  Atomic Mass: 4.00  Density: 214 kg m-3 The boiling point is -268.93oC The melting point of –272.2oC Protons: 2  Electrons: 2  Neutrons: 2 Electron configuration: 1s2

Valence Electrons: 2


 * Janssen was the first to discover He in 1868 by detecting a new line in the solar spectrum
 * Helium Is produced from natural gas
 * Helium is the only liquid that can not be solidified by lowering the temperature



Unstable atoms shoot out alpha particles, which then two neutrons and two protons stick together to form a helium atom <span style="font-family: Georgia,serif; font-size: 120%;">Helium was combined with oxygen to form a nitrogen free atmosphere for divers <span style="font-family: Georgia,serif; font-size: 120%;">The cost of helium per gram in a tank is $0.53 <span style="font-family: Georgia,serif; font-size: 120%;">Interesting facts: <span style="font-family: Georgia,serif; font-size: 120%;">About 0.0005% of helium makes up earths atmosphere <span style="font-family: Georgia,serif; font-size: 120%;">Helium can be used as an inert shield for arc welding

webelements, [], [|Mark Winter], 1993-2012

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