JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties Question Bank Atomic and lonic radii

  • question_answer The order of magnitude of ionic radii of ions \[N{{a}^{+}},M{{g}^{2+}},A{{l}^{3+}}\] and \[S{{i}^{4+}}\] is [MP PMT 1996]

    A) \[N{{a}^{+}}<M{{g}^{2+}}<A{{l}^{3+}}<S{{i}^{4+}}\]

    B) \[M{{g}^{2+}}>N{{a}^{+}}>A{{l}^{3+}}>S{{i}^{4+}}\]

    C) \[A{{l}^{3+}}>N{{a}^{+}}>S{{i}^{4+}}>M{{g}^{2+}}\]

    D) \[N{{a}^{+}}>M{{g}^{2+}}>A{{l}^{3+}}>S{{i}^{4+}}\]

    Correct Answer: D

    Solution :

    \[N{{a}^{+}}>M{{g}^{2+}}>A{{l}^{3+}}>S{{i}^{4+}}\]. All are isoelectronic but nuclear charge per electron is greatest for \[S{{i}^{4+}}\]. So it has smallest size and nuclear charge per electron for \[N{{a}^{+}}\] is smallest. So it has largest size.

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