What characteristic distinguishes helium (He) from the other noble gases?

The characteristic that distinguishes helium (He) from the other noble gases is its atomic structure, specifically its low Atomic Mass and the fact that it has only two electrons. This results in helium being a lighter gas and having a much lower boiling point compared to the heavier noble gases like neon, argon, krypton, and xenon. Additionally, helium is unique in that it can remain in a liquid state even at absolute zero under high pressure, while other noble gases solidify under similar conditions.