The Correct Order of Radii is

By Sakshi Yadav|Updated : August 9th, 2022

The correct order of radii is F−<O2−<N3−. The size of isoelectronic falls with rising atomic number. In isoelectronic species,
Ionic radii are ∝1Z
Since F−,O2− and N3− have the exact number of electrons, so the order of ionic radii is: F−<O2−<N3−
The general periodic trend of the atomic radii falls from left to right in a period and rises down the group.


The Correct Order of Radii is

Effective nuclear charge (i.e., Z/e ratio) falls from F − F- to N 3 − N3- hence the radii follows the order : F − < O 2 − < N 3 − Z / e for F − = 9 / 10 = 0.9 F-.

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