Rare gas

The rare gases , so called rare gases or inert gases , are a chemical Série including/understanding the chemical elements group 18 (in the past group VIIIA) of the periodic Tableau of the elements. The following elements are rare gases: Helium, Neon, Argon, Krypton, Xenon, and Radon. The Ununoctium, artificial element recently synthesized would form also part of the series.

The family of the rare gases presents a characteristic: they are elements far from reactive because they have a electronic Couche external (Couche of valence) complete. This layer saturated with electron S is very stable and thus the atom does not yield nor does not accept other electrons. The chemical bonds are thus quasi-impossible for the noble Gaz, with the result that contrary to the majority others Gaz, they are monoatomic.

This characteristic reveals a gold rule of the Chimie, the Règle of the byte : any atom tends to supplement its layer of valence, that while collecting or by yielding electrons to other atoms.

It is possible to obtain compounds with the rare gases heaviest. The latter have values of Potentiel of ionization lower than those of the lightest members of the series. Thus some derivatives of Xenon, especially of fluorides, could be obtained at strong temperatures (+300 °C) and of strong Pressure S.

Simple: Noble gas

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