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.