First slide
Periodic Trends

Which of the following orders of ionic radii is correctly represented?


Cations lose electrons and are smaller in size than the parent atom, whereas anions add electrons and are larger in size than the parent atom. Hence, the order is H->H>H+. For isoelectronic species, the ionic radii decreases with increase in atomic number i.e. nuclear charge. Hence, the correct orders are

 O2->F->Na+and N3->Mg2+>Al3+

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