Pierwiastek promieniotwórczy o symbolu Rn (Z=86), odkryty przez Dorna w 1901 roku. Radon jest gazem szlachetnym, bezbarwnym i bezwonnym. Radon powstaje wskutek rozpadu radu. Najbardziej znane izotopy radonu to: Rn-219 (aktynon), Rn-220 (toron), Rn-222 (radon).
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