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actinium C'
радиоакт. actinium C' (AcC', 211Po, AcC', 211Po)
actinium C
радиоакт. actinium C (AcC, 211Bi, AcC, 211Bi)
actinium C"
радиоакт. actinium C" (AcC", 2O7T1, AcC", 207Tl)