• # question_answer Fluorine, chlorine, bromine and iodine are placed in the same group (17) of the periodic table, because [KCET (Med.) 1999] A) They are non-metals B) They are electronegative C) Their atoms are generally univalent D) They have 7 electrons in the outermost shell of their atom

Electronic configuration of outermost shell of group-17 or halogens are $n{{s}^{2}}\,\,n{{p}^{5}}$.