Consider the following species :

N3-, O2-, F-, Na+, Mg2+ and Al3+

(a) What is common in them?

(b) arrange them in the increasing ionic radii?

a) These all are isoelectronic species i.e. they all have 10 electrons with the electronic configuration..


b) order of ionic radii

As the magnitude of positive charge decreases the ionic radii of the species increases, thus cations are smaller in size then anions and, among the cations, ions having high positive charge have small ionic radii. Similarly, among the anions, ions having high negative charge have large ionic radii.

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