JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties Question Bank Valency and oxidation state

  • 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

    Correct Answer: D

    Solution :

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

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