Answer :

(i) Element C belongs to group 10 because it has 8 elements in the last shell and its valency is 0.

(ii) elements belongs to group 15 because it has 5 electrons in its last shell.


(iii) an element belongs to the group 13 because it has 3 electron in its valence shell.


(iv) These elements belong to the 2nd period because all the 2 shells are filled.


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