Noble gas
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The noble gases mak a group o chemical elements wi seemilar properties. Unner staundart condeetions, thay are aw odourless, colourless, monatomic gases wi very law chemical reactivity. The sax noble gases that occur naiturally are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), an the radioactive radon (Rn).
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