Inert Gas
| Also Known As | Noble gas, rare gas, unreactive gas, Group 18 element |
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What is Inert Gas?
An inert gas is a gas that does not undergo chemical reactions under normal conditions. In the strictest sense, this refers to the noble gases (Group 18: He, Ne, Ar, Kr, Xe, Rn) because their complete outer electron shells make them chemically unreactive. The term is also applied loosely to other gases (N₂, CO₂) that are non-reactive in specific applications like welding or food packaging.
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
An inert gas is a gas that does not undergo chemical reactions under normal conditions. In the strictest sense, this refers to the noble gases (Group 18: He, Ne, Ar, Kr, Xe, Rn) because their complete outer electron shells make them chemically unreactive. The term is also applied loosely to other gases (N₂, CO₂) that are non-reactive in specific applications like welding or food packaging.
Welding shielding gas (Ar, He — protect weld from oxidation). Inert atmosphere for reactive chemical handling. Lighting (neon signs, argon bulbs). Cryogenics (helium, argon). Food packaging (N₂, Ar — prevent oxidation). Fire suppression systems (argon). NMR and mass spectrometry carrier gases.
Asphyxiation hazard — all inert gases displace oxygen in enclosed spaces. No odor warning. Cryogenic forms (liquid He, liquid Ar) cause cold burns. Pressure cylinder hazards. Radon is radioactive — lung cancer risk from residential radon gas.