Helium
Helium is one of the noble gases among Argon, Krypton, Neon, Radon and Xenon. A helium atom consists of two protons, two neutrons and two electrons. The electrons are located in the same, closed electron shell. The completely filled electron shell causes helium to be very inert. So far, no chemical compound with helium has been discovered.
Helium as inert gas
Even under extreme conditions, helium does not form compounds with other elements. Due to this inertness, helium is perfectly suited as an inert gas for industry. For example, for welding or laser cutting, helium displaces the ambient air and prevents chemical reactions between the heated metal and the oxygen contained in the air.
See also
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