Question

Why is manganese more stable in the $+2$ state than the $+3$ state and the revers is true for iron?

Answer 1

${Mn}^{2+}$ is more than ${Mn}^{3+}$ due to the stable electronic configuration of ${Mn}^{2+}$ because of half-filled d-orbital ${Fe}^{3+}$ is more stable than ${Fe}^{2+}$ because ${Fe}^{3+}$ has exactly half-filled d-orbitals which give the stability to ${Fe}^{3+}$ while ${Fe}^{2+}$ has ${3d}^0$ electronic configuration.