Answer :

(i) Pair of isotope are A and F because they have the same atomic number.


Pair of isobar are D and E because they have the same mass number.


(ii) Valency of element B can be determined by electronic configuration, for the element B is 2, 1. The valency is 1.


Electronic configuration for E is 2, 8, 8, 2. So the valency is 2.


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