Question

The ion which shows maximum paramagnetic character among the bivalent ions of the first transition metal series is :

• A. Co${}^{2+}$
• B. Cu${}^{2+}$
• C. Cr${}^{2+}$
• D. Fe${}^{2+}$
• E. Mn${}^{2+}$

Answer 1

The correct option is E Mn${}^{2+}$

$M{n}^{2+}$ ion show maximum paramagnetic character among the bivalent ions of first transition metal series.

Electronic configuration of $M{n}^{2+}$ is $\left[Ar\right]4s^{0}3d^5$. In this ion $d$- orbital is half filled and has 5 unpaired electrons, thus it shows maximum paramagnetic character.

Hence, option E is correct.