The composition of the nuclei of two atomic species X and Y are given as under Protons = 6(X): 6(Y) Neutrons = 6(X): 8(Y). Give the mass numbers of X and Y. What is the relation between the two species?

The composition of the nuclei of two atomic species X and Y are given as under Protons = 6(X): 6(Y) Neutrons = 6(X): 8(Y)

Atomic mass of X = Number of protons + Number of neutrons = 6 + 6 = 12.

Atomic mass of Y = Number of protons + Number of neutrons = 6 + 8 = 14.

These two atomic species, X and Y, have the same atomic number but different mass numbers. Hence, they are isotopes.

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