Explain briefly. Helium does not form He2 molecule
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According to the molecular orbital theory He has two electrons in the outermost shell and thus it is chemically stable because it's duplet is complete. Hence it does not participate in the bond formation and molecule must have a bond to exist which is not in case of Helium.
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He2 doesn't exist because helium is a noble gas. They are already stable, they don't lose or gain electrons to become stable. So, He2 is not possible to exist
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