Q.13:- Composition of the nuclei of two atomic species X and Y are given as under:
Protons = 6 6
Neutrons = 6 8
Give the mass numbers of X and Y. What is the relation between the two species?
Mass number of X = No. of protons + No. of neutron
= 6 +6 = 12
Mass number of Y = 6 + 8 = 14
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