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Mass number of X=no. of protons + no. of neutrons =17+18=35
Mass number of Y = no. of protons +no. of neutrons =17+20=37
These two atomic species X and Y have the same atomic number but different mass numbers. Hence they are isotopes.
Mass number of Y = no. of protons +no. of neutrons =17+20=37
These two atomic species X and Y have the same atomic number but different mass numbers. Hence they are isotopes.
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