The noblegases are a group of chemical elements with very similar properties: under
standard conditions, they are all odorless, colorless, monatomic gases, with very
low chemical reactivity. Because their outer shell of valence electrons are
considered to be full.
The six noble gases that occur naturally are Helium (He),
Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and the radioactive Radon
(Rn).
Resource: http://en.wikipedia.org/wiki/Noble_gas
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