Consider the following species : N3-, O2-, F-, Na+, Mg2+ and Al3+ (a) What is common in them (b) - Chemistry - Classification of Elements and Periodicity in Properties

Question

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?

Pankaj Singh · Accepted Answer

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

${1 s}^{2} {2 s}^{2} {2 p}^{6}$

b) order of ionic radii

${A l}^{3 +} > {M g}^{2 +} > {N a}^{+} > F^{-} > O^{2 -} > N^{3 -}$

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.

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?

Consider the following species :

N^3-, O^2-, F^-, Na⁺, Mg²⁺ and Al³⁺

(a) What is common in them?

(b) arrange them in the increasing ionic radii?