The order of magnitude of ionic radii of ions Na+, Mg2+, Al3+ and Si4+ is :

  1. A

    Na+<Mg2+<Al3+<Si4+

  2. B

    Mg2+>Na+>Al3+>Si4+

  3. C

    Al3+>Na+>Si4+>Mg2+

  4. D

    Na+>Mg2+>Al3+>Si4+

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    Solution:

    The order of magnitude of ionic radii of ions Na+>Mg2+>Al3+>Si4+. All are isoelectronic, but Si4+ has the highest nuclear charge per electron. As a result, Na+ has the smallest size and nuclear charge per electron.

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