Answer :
Chlorine will more likely to form bonds with the elements of group 1 as it has 7 valence electrons.
Chlorine element:
Chlorine is an element that is present in group 17. This family is also known as the Halogen family. The elements of this group will have seven electrons in their outermost shell. It has only one electron less to attain a stable noble electron configuration.
Thus, it will form bond more readily with Group 1 that has only one electron in its outermost shell.
Thus, correct option is a.
Find more information about Outermost electron here:
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