In group 17 how many valences electrons does Iodine have? How many valence electrons does Chlorine have?

Group 17 is of halogens (non-metals). Iodine has 7 electrons in the outer shell and Chlorine has 7 electrons in its outermost shell so will gain 1 more to complete the octet.

Iodine is one of the members of Group 17,which are usually called as Halogens. The electronic configuration is (kr)4d(10)5s(2)5p(7) so in last subshell there is 7 valence electron and valency is 1

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