Noble gas
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A noble gas is a group of elements that are all gases. They do not react with other chemical elements to form chemical compounds. There are six noble gases: helium, neon, argon, krypton, xenon, and radon. These elements all share a group on the periodic table.
All of these gases are found in air, and argon is found the more in air than other places. If we breathed one of the noble gases without breathing any oxygen, we would die. This does not happen though, because the amount of these gases in the air is so small. Radon can be deadly because it is radioactive.