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едноезични примери (не са проверени от PONS редакцията)
This research resulted in the successful identification of a new element in the decay chain between uranium-235 and actinium, later named protactinium.
en.wikipedia.org Polonium-208 and actinium-227 were also considered as alpha sources.
en.wikipedia.org The actinide series comprises the elements from actinium to lawrencium.
en.wikipedia.org Polonium, radium and radon were observed before actinium, but they were not isolated until 1902.
en.wikipedia.org Ac one tonne of ore contains about 0.2 milligrams of actinium.
en.wikipedia.org