Chemistry, asked by samueldaniel2465, 10 months ago

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Answered by Priyanca
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Mass no. is the sum of protons and neutrons of an atom..
So mass no. for X is = 17+18=35
And..mass no. of Y= 17+20=37
Since both have same no. of protons(atomic no.) but different mass no....therefore, both are ISOTOPES..
Hope it helps<33
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