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What is the lightest inert?

Updated: 8/10/2023
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12y ago

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Helium is the lightest inert gas. It is a monatomic gas with an average atomic weight of about 4.

The only atom lighter than that is hydrogen - which forms a diatomic gas with molecular wight of about 2 - BUT - it is anything but inert! Hydrogen is highly flammable and a commonly used reactant for a lot of syntheses. The next lightest gas that is sort of inert is nitrogen - which is quite a bit heavier - at a molecular weight of about 14. (Nitrogen is not particularly reactive at room temperature so it is often used as an "inert" gas - even though it isn't really totally inert.) The next lightest noble gas is Neon - which, although it forms a monatomic gas, has an atomic wight of about 20 - even heavier than Nitrogen.

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Vincent Hilpert

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2y ago
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