Is Helium Reactive?

No, helium is not reactive. 

WestAir supplies helium across California and Arizona.

What Makes Helium Non-Reactive?

Helium’s two electrons completely fill its outer shell, creating what chemists call a “duet configuration.” That’s the most stable arrangement an atom can have, so helium has zero reason to gain, lose, or share electrons with anything else.

Its ionization energy is 2,372.3 kJ/mol. In plain terms, you’d need an enormous amount of energy just to knock one electron loose. You could blast helium with strong acids, strong bases, oxidizing agents, or extreme heat and nothing happens.

Scientists have managed to force helium into a compound (Na₂He, or sodium helide) under ultra-high pressure in a lab. The result was unstable and had no practical use. Under any conditions you’d encounter in a welding shop, medical facility, or manufacturing floor, helium simply doesn’t form compounds.

That total chemical inertness is why helium shows up wherever trace contamination can ruin a product or a process.

How Is Helium’s Non-Reactivity Useful for Industrial Applications?

Helium’s non-reactive nature supports various industrial processes, such as:

• Welding: helium serves as a shielding gas that prevents reactions from compromising weld quality.
• Medical uses: helium is mixed with oxygen in breathing support devices because it won’t react with other gases or body tissue.
• Fiber optic cable production: helium’s inert properties create the controlled environment needed to produce ultra-pure glass fibers.

How Do You Safely Handle Helium?

While helium is not reactive, it requires careful handling. 

A boiling point of -268.9°C (-452.1°F) and an atomic size small enough to escape through tiny openings mean storage matters. Steel cylinders are the industry standard because of their low helium permeability. Aluminum cylinders are also used where lighter weight is needed, though they have higher permeability than steel.

Even though helium won’t react chemically, it can pose physical challenges in industrial settings, such as:

• Accumulation in confined spaces due to high leakage rate.
• Risk of asphyxiation as a result of oxygen displacement.
• Cryogenic burns (in case of liquid helium).
• Sudden pressure buildup in sealed systems if helium warms up.

To avoid these issues, proper temperature and pressure conditions are crucial when transporting and handling helium.

The key guidelines to follow include:

• Always transport cylinders in an upright position and secure them with straps or chains to prevent tipping or rolling.
• Ensure the protective cap is in place over the valve during transport to prevent damage or accidental release of gas.
• Transport helium in well-ventilated vehicles to prevent oxygen displacement in case of a leak.
• Ensure cylinders are clearly labeled with proper hazard symbols and that all required shipping documents are on hand.

Further Reading: Is Helium Flammable?

The Bottom Line

Helium’s chemical inertness, low boiling point, low density, and high thermal conductivity make it indispensable across industries.

Further Reading: What Is Liquid Helium Used For?

Nick Vasco

Nick is an experienced B2B writer who brings his skill for crafting clear, easily digestible content to the industrial gas space.