Howstuffworks "Noble gas - Encyclopedia Entry"

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Noble gas

Noble gas refers to any of a group of six chemical elements. These elements are argon (Ar), helium (He), krypton (Kr), neon (Ne), radon (Rn), and xenon (Xe). They occur naturally and can be found in the atmosphere. The British scientists Lord Rayleigh and William Ramsay discovered the noble gases during the late 1890's.

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Noble gas refers to any of a group of six chemical elements. These elements are argon (Ar), helium (He), krypton (Kr), neon (Ne), radon (Rn), and… More>>

Krypton