JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Topic Test - Chemical Periodicity (5-5-21)

  • question_answer
    Which one of the following sets of ions represents the collection of isoelectronic species  

    A) \[{{K}^{+}},C{{l}^{-}},M{{g}^{2+}},S{{c}^{3+}}\]

    B) \[N{{a}^{+}},C{{a}^{2+}},S{{c}^{3+}},{{F}^{-}}\]

    C) \[{{K}^{+}},C{{a}^{2+}},S{{c}^{3+}},C{{l}^{-}}\]

    D) \[N{{a}^{+}},M{{g}^{2+}},A{{l}^{3+}},Cl\]

    Correct Answer: C

    Solution :

    [c] Isoelectronic species are those which have same no. of electrons.
                            \[{{K}^{+}}=19-1=18\] ; \[C{{a}^{+2}}=20-2=18\]
                            \[S{{c}^{+3}}=21-3=18\] ; \[C{{l}^{-}}=17+1=18\]


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