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After 1 a and 2 ß-emissions
(a) Mass number reduces by 4
(b) Mass number reduces by 5
(c) Mass number reduces by 6
(d) Mass number increases by 4
(a)
Emission of 10 particle led to decrease in atomic no. by 2 while mass number by 4. On the other hand, emission of 2ß particles increases atomic number by 2. Hence, overall emission of, 1a and 2ß particles led to decrease in mass number by 4.
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