Helium is an odorless, colorless gas at room temperature. It is less dense than air. That's why helium balloons float. It is a non-reactive gas, a member of the Noble gas family. Its melting point is -272.2 oC and its boiling point is -268.93 o A chemical property of Helium is? A) it’s boiling point of -268.93 oC B) the fact that it’s less dense than air C) It’s lack of color (colorless) D) It’s non-reactivity