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Noble gas

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The noble gases are a group of elements that are all gases. They almost do not react with other elements. This is because they have a full outer electron shell. There are six noble gases: helium, neon, argon, krypton, xenon, and radon. These elements all share a group on the periodic table (Group 8).

All of these gases are found in air. They make up around 0.96% of the atmosphere.

When they are used in cold cathodes to produce light, some of noble gases have different colors.Since Radon is radioactive, it is usually not used for lightning.

Ununoctium (Element 118) is probably the next noble gas, after Radon. It has been synthesised in 2006. With a half life of 0.89 ms, after which it decays to Ununhexium (Element 116), its use is probably limited.

Helium

Neon

Argon

Krypton

Xenon
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