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For each pair of ions, choose the one that has the smaller radius.  Na+ or Mg2+  Cl- or K+
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For each pair of ions, choose the one that has the smaller radius.  Na+ or Mg2+  Cl- or K+

User MmixLinus
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Mg2+...because it loses 2 electron which is on its valence shell making it empty and making it have jst 2 shells. The radius calculated from d nucleus to the new valence shell is then smaller than that of Cl^- and k+
User Nava Carmon
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