Here is a brief description of helium. 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. Emma's first birthday balloon is filled with helium and so rises in air. Isolation Here is a brief summary of the isolation of helium.