Composition of the nuclei of two atomic species ‘X’ and ‘Y’ are given as under
Protons 6 6
Electrons 6 8
Give the mass numbers of X and Y. What is the relation between the two species?
Mass number of X = 6 + 6 = 12
Mass number of Y 6 + 8 = 14
Atomic number of X = 6
Atomic number of Y = 6
X and Y are isotopes, since both the elements contain equal number of atomic number and different mass number.