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After 1α and 2 β-emissions
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- mass number reduces by 4
- mass number reduces by 5
- mass number reduces by 6
- mass number increases by 4
Correct Option: A
Emission of 1α particle led to decrease in atomic number by 2 while mass number by 4. On the other hand, emission of 2β particles increases atomic number by 2. Hence, overall emission of, 1α and 2β particles led to decrease in mass number by 4.
