Why helium does not forms molecules?

Look at where He is on the Periodic Table. It is one of the "Inert Gases". The reason all of these exist as gases in the monotonic form is because of the quantum mechanical nature of their electronic structure. Their electronic configuration or energy state is such that they are perfectly happy as they are. They do not need an extra electron or to share an electron or to give up an electron to be energetically "happy". Therefore, they do not chemically bond to any other atoms, not their own kind or any other kind. This "scientific law" has actually been violated (scientists found an exception). Researchers were able, by using very extreme conditions, to get Ar to react to form a coumpound that was "stable" under these very extreme conditions. As soon as the conditions changed, the Ar compound disintegrated and the Ar was left by itself again.

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