Question

In between Mn2+ and Fe2+ which one is more stable and why? (Atomic no. Mn-25, Fe-26 )​

Answer 1

Explanation:

Electronic configuration of Mn2+ is [Ar]18 3d5.

Electronic configuration of Fe2+ is [Ar]18 3d6.

It is known that half-filled and fully-filled orbitals are more stable. Therefore, Mn in (+2) state has a stable d5 configuration. This is the reason Mn2+shows resistance to oxidation to Mn3+. Also, Fe2+has 3d⁶ configuration and by losing one electron, its configuration changes to a more stable 3d5 configuration. Therefore, Fe2+ easily gets oxidized to Fe+3 oxidation state.

Answer 2

Answer = Since Mn2+ stable half filled elotrionic configuration , therefore Mn2+ compounds are most stable than Fe2+ toward oxidation of their +3 state . Fe2+ (3df) can lose one electronic easily to give Fe3+(3df stable configuration)