Question

In the isoelectronic species the ionic radii (A) of $N^{3-},Ne$ and $A{I}^{+3}$ are respectively given by:

• A. $1.36,1.40,1.71$
• B. $1.36,1.71,1.40$
• C. $1.71,1.40,1.36$
• D. $1.71,1.36,1.40$

Answer 1

The correct option is C $1.71,1.40,1.36$

In the isoelectronic species the ionic radii (A) of $N^{3-},Ne$ and $A{I}^{+3}$ are respectively given by $1.71,1.40,1.36$. All of these species contains same number of electrons. As the atomic number increases, the effective nuclear charge increases. The attraction of the nucleus for the valence electrons increases. Hence, the ionic radii increases.