Composition of nuclei of two atomic species X and Y are given as under.
`|{:(,"X","Y"),("Protons",6,6),("Neutrons",6,8):}|`
Give the mass number of X and Y. What is the relation between the two species?

Explanation

Mass number of `X=6+6=12`
Mass number of `Y=6+8=14`
So these two species have same atomic number (same number of protons ) and different mass numbers. Therefore these two species are isotopes.