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The radionucleide undergoes two successive β-decays followed by one adecay.

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The radionucleide  undergoes two successive β-decays followed by one adecay. The atomic number and the mass number respectively of the resulting radionucleide are
(a) 92 and 234
(b) 94 and 230
(c) 90 and 230
(d) 92 and 230.

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