The JokeHelium walks into a bar and orders a beer.
The bartender says “We don’t serve noble gases in here.”
The Helium doesn’t react.
Background
Helium is one of the the least reactive elements in nature, because it is a noble gas. The properties of the noble gases can be well explained by modern theories of atomic structure: their outer shell of valence (outer) electrons is considered to be "full", giving them little tendency to participate in chemical reactions.
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