Q.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 = No. of protons + No. of neutron
= 6 +6 = 12
Mass number of Y = 6 + 8 = 14
The species X and Y are the isotopes because their atomic numbers are same and their mass numbers are different, i.e.
and 