Chemistry

Question Analysis
This question involves comparing the ionic radii of two different cations of the same element.
The main focus is on the radius trend for isonuclear ions (same element, different charges).

Key Concept Explanation
Isonuclear ions have the same nuclear charge but different numbers of electrons. For cations of the same metal, a higher positive charge means fewer valence electrons.
With fewer electrons, there is less electron-electron repulsion in the electron cloud, and the same nuclear charge can pull the remaining electrons closer, resulting in a smaller ionic radius.

Step-by-Step Solution
1. Confirm Fe²⁺ and Fe³⁺ are isonuclear (same number of prot...