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Spontaneous and continuous disintegratio...

Spontaneous and continuous disintegrationof a nucleus of aheavy element with the emission of certain types of radiation is known as radioactivity:-The radioactive isotope 'D’ decays according to the sequence `Doverset(beta^-)(rarr)D_1overset(alpha)(rarr)D_2`If the mass number and atomic number of `D_2` are 172 and 71 respectively, what are the (i) Mass number, (ii) atomic number of D

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