To what extent do the electronic configuration decide the stability of oxidation states in the first series of transition elements ? Illustrate your answer with example .

To what extent do the electronic configuration decide the stability of

1.	To what extent do the electronic configuration decide the stability of oxidation states in the first series of transition elements ? Illustrate your answer with example .
Answer» Solution :In a transition series, the oxidation STATES which lead to noble GAS or exactly half- FILLED or completely filled d- orbitals are more stable. For example, in the first transition series, electronic configuration of Mn `(Z= 25)` is `[Ar]3D^(5) 4s^(2)`. It shows oxidation states `+2` to `+7` but Mn (II) is most stable becasue it has the half - filled configuration `[Ar] 3d^(5)` Similarly `Sc^(3+)` and `Zn^(2+)` are more stable asillustration below `:` `. _(21) Sc = [Ar] 3d^(1) 4s^(2) , Sc^(3+) = [Ar] , i.e., `noble gas configuration `._(30)Zn = [Ar] 3d^(10) 4s^(2) , Zn^(2+) =[ Ar] 3d^(10) , `i.e., completely filled configuration