tell me how 17 came in the answer....after the alpha emission....
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Thats a misprint....... After alpha emission atomic number will decrease by 2 so X3 would have atomic number - 1 and mass number-4
Anonymous:
i was also thinking the same that its was a misprint but still for clearance i asked
i was ab due to fever during this lecture. Well thnq u Akshat
no prob
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