Question: After alpha decay, what is the difference in mass number between the daughter and the parent nuclei? (a) The mass number of the daughter nucleus

After alpha decay, what is the difference in mass number between the daughter and the parent nuclei? 

(a) The mass number of the daughter nucleus is smaller by four. 

(b) The mass number of the daughter nucleus is larger by four. 

(c) The mass number of the daughter nucleus is smaller by two.

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