Wikipedia:Main Page history/2018 September 18

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Noble gas

The noble gases are a group of chemical elements with similar properties in the periodic table. The six noble gases that occur naturally are helium, neon, argon, krypton, xenon, and the radioactive radon. Under standard conditions, the gases are all colorless, odorless, tasteless, and nonflammable. The noble gases show extremely low chemical reactivity, and only a few hundred noble gas compounds have been formed.

This picture shows argon in a gas discharge tube.

See images of other noble gases: Helium; Neon; Krypton

Photograph: Alchemist-hp

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