Answer :

(a) Isotopes of cobalt – Treatment of cancer


Explanation:


Isotopes of cobalt are used in the treatment of thyroid cancer and some cancer which occurs rarely.


(b) Valency of nitrogen – Three


Explanation:


The atomic number of nitrogen = 7


The electronic configuration of 7N= 2,5


The valency of nitrogen is 3 because it combines with other element and receives three electros to complete the outermost shell (8-5=3)


(c) Non – metal – Receives electrons


Explanation:


Non- metals tend to receive electrons to complete their outermost shell. Outermost shell is the only shell which participates in the chemical reaction.


(d) Metal – loses electrons


Explanation:


Metals tend to loose electrons to complete their outermost shell.


(e) Valency – Electrons in the outermost orbit


Explanation:


Valency is the number of electrons in the outermost shell.


For example, carbon has 4 electrons in the outermost shell. Thus, the valency of carbon is 4.


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