Chapter 19, Problem 39QAP

Interpretation Introduction

Interpretation: The reason for less paramagnetic nature of ${\text{[Cr(CN)}}_{\text{6}}{}^{\text{4-}}\text{]}$ in comparison to ${\text{[Cr(H}}_2{\text{O)}}_{\text{6}}{}^{\text{2+}}\text{]}$

Concept introduction:A transition metal cation has no outer s- electrons available for bonding, rather the inner d -electrons (in case of 3d transition metal elements) are available for making coordinate bonds with the ligands. Electrons are distributed in the five d- orbitals according to Hund’s rule which results in a maximum number of unpaired electrons. Abbreviated termsare used for the noble gas configuration.