Composition of the nuclei of two atomic species A and B is given as under A protons 18 , B 20 Neutron A 22 B 20. (i) What are the mass numbers of A and B? (ii) How are they related to each other?

(i) Mass number of A

Number of protons + Number of neutrons= 17+ 18 = 35

Mass number of B

Number of protons + Number of neutrons=17 + 20 = 37

(ii) These given two species A and B are isotopes, as they have the same number of protons in their nuclei.

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