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радий С'stresses
радиоакт. Radium C' (RaC', 214Ро, RaC', 214Po)
радий С
радиоакт. Radium C (RaC, 214Bi, RaC, 214Bi)
радий С"
радиоакт. Radium C" (RaC", 210Tl, RaC", 21⁰T1)