​ Why are E^Θ M^2+/M Values of Mn and Zn more negative than expected ? ​

Question

Why are \(E^{\Theta}_{M^{2+}/M}\) Values of Mn and Zn more negative than expected ?

Answer 1

Mn → Mn⁺² + 2e^-

Zn → Zn⁺² + 2e^-

The electronic configuration of Mn⁺² = [Ar] 3d⁵

and Zn⁺² = [Ar] 3d¹⁰

due to the formation of half filled (Mn⁺²) d-subshell and full filled (Zn⁺²) d-subshell.

half filled and full filled d-subshell has some greater stability than as expected.

because of that Mn & Zn have more negative reduction potential value as expected.