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13. Composition of the nuclei of two atomic species X and Y are given as under

     X   Y

Protons = 6   6

Neutrons = 6   8
Give the mass numbers of X and Y. What is the relation between the two species?
Answer :

Mass number of X: Protons + neutrons = 6+6 = 12

Mass number of Y: Protons + neutrons = 6+8 = 14

They are the same element as their atomic numbers are the same.

They are isotopes as they differ in the number of neutrons and hence their mass numbers.