What are the acid/base properties of helium?
None whatsoever. Helium is neither an acid nor a base, by any definition you care to apply. In fact, helium isn’t much of a reactant at all. It’s not an acid, not a base, not an oxidizing agent, not a reducing agent, etc, etc. There are two main reasons for helium’s relative stability: (1) helium atoms have a full outer energy level (actually, they only have ONE energy level, and that one’s full) and (2) helium atoms are very small. The closeness of helium’s electrons to its nucleus keeps them tightly bound. I hope that helps. Good luck!
