1. Tardigrade
  2. Question
  3. Chemistry
  4. Consider the isoelectronic species, Na+, Mg2+, F- and O2-. The correct order of increasing, length of their radii is

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Q. Consider the isoelectronic species, $Na^+$, $Mg^{2+}$, $F^-$ and $O^{2-}$. The correct order of increasing, length of their radii is

Classification of Elements and Periodicity in Properties

Solution:

For isoelectronic species, ionic radii decrease with increase in nuclear charge (i.e., no. of protons). Thus, the cation with greater +ve charge will have a smaller radius and the anion with greater -ve charge will have a larger radius. Thus, the correct order of Increasing ionic radii is $Mg^{2+} < Na^+ < F^- < O^{2-}$.