Question

Write the different oxidation states of iron. Why +2 oxidation state of manganese is more stable?
(Z of Mn = 25).

Answer 1

The different oxidation states of iron are $+2,+3,+4,+5,+6$.
+2 oxidation state of manganese is more stable as it has half filled 3d subshell.
Hlaf filled and completely filled subshells have extra stability due to symmetrical electron distribution which allows maximum electron exchange.
The electronic configuration of $M{n}^{2+}=\left[Ar\right]3d^{5}4s^0$