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(, Sun 1 Apr 2001, 1:00)
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'Noble' refers to chemical reactivity, not radioactivity.
All the noble gases (Helium, neon argon, krypton, xenon, radon) have radioactive isotopes. In fact, all of radon's isotopes are radioactive.
(, Mon 18 Aug 2008, 14:54, Reply)

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