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- {{Infobox element The most stable isotope of the element is promethium-145, which has a specific activity of 940 Ci/g (35 TBq/g) and8 KB (1,103 words) - 19:19, 17 December 2022
- {{Infobox element ...xtremely radioactive element. It's very close to impossible to obtain this element in a hobby or even a professional laboratory.7 KB (892 words) - 18:28, 11 October 2022
- {{Infobox element '''Actinium''' ('''Ac''') is a highly radioactive, silvery-metallic element with a bluish glow due to its extreme radiation.8 KB (1,083 words) - 22:06, 17 September 2022
- {{Infobox element '''Radon''' is a chemical element with the symbol '''Rn''' and atomic number 86. It is a radioactive, colorle10 KB (1,336 words) - 18:59, 23 December 2021
- {{Infobox element ...symbol '''At''' and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavie9 KB (1,211 words) - 19:49, 23 December 2021