Further information Description Helium is one of the so-called noble gases. Helium gas is unreactive, colourless, and odourless. Helium is available in pressurised tanks.
Elemental helium is a colourless odourless monoatomic gas.
Helium is the second most abundant element in the universe after hydrogen. Helium is also good for making your voice squeaky after taking a gulp from a balloon. Both values are quoted on the Pauling scale. The following CrystalMaker image represents the solid state structure. For most elements, the most stable allotrope is illustrated.