Answer pls sir.

Dear student,


Ans. 1




Ans.2-
Mass no  of X = ( protons+neutrons)
                          =(17+18) = 35

Mass no. of Y=  (protons + neutrons)
                         = (17+20)= 37
Since the no. Of protons is same (atomic no.) So, they are isotopes of same element.



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