PONS OpenDictДобави предложение
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едноезични примери (не са проверени от PONS редакцията)
Promethium-147 is produced in large quantities (compared to other isotopes) by bombarding uranium-235 with thermal neutrons.
en.wikipedia.org The promethium in the outer envelope may be generated by the spontaneous fission of higher mass transuranic elements.
en.wikipedia.org Originally, radium-226 was used for the purpose, but it was later replaced by promethium-147 and tritium (hydrogen-3).
en.wikipedia.org There are two possible sources for natural promethium: rare decays of natural europium-151 (producing promethium-147), and uranium (various isotopes).
en.wikipedia.org Elements with atomic numbers 1 through 40 are all stable, while those with atomic numbers 41 through 82 (except technetium and promethium) are metastable.
en.wikipedia.org