The ions O 2- , F - , Na + , Mg 2 + and Al 3 + are isoelectronic. Their ionic radii shows:

Chemistry · JEE Main · NTA ExamsClassification of Elements and Periodicity in Properties

The ions O2-, F-, Na+, Mg2+ and Al3+ are isoelectronic.  Their ionic radii shows:
  1. an increase from O2- to F- and then decrease form Na+ to Al3+
  2. a decrease from O2- to F- and then increase from Na+ to Al3+
  3. a significant increase from O2- to Al3+
  4. a significant decrease from O2- to Al3+

Answer

(D) a significant decrease from O 2- to Al 3 +

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