Account for the following:(i) Mn is more stable than Fe+7.towards oxid

1.	Account for the following:(i) Mn is more stable than Fe+7.towards oxidation to +3 state.(ii) The enthalpy of atomisation is lowestfor Zn in first series (3d) of thetransition elements. Delhi 2014
Answer» 1)Electronic configuration of Mn2+is [Ar]183d5. Electronic configuration of Fe2+is [Ar]183d6. It is known that half-filled and fully-filled orbitals are more stable. Therefore, Mn in (+2) state has a stable d5configuration. This is the reason Mn2+shows resistance to oxidation to Mn3+. Also, Fe2+has 3d6configuration and by losing one electron, its configuration changes to a more stable 3d5configuration. Therefore, Fe2+easily gets oxidized to Fe+3oxidation state. 2)The more extensive themetallic bonding of an element, the more will be its enthalpy of atomization. In all transition metals (except Zn, electronic configuration: 3d10 4s2), there are someunpairedelectrons that account for their strongermetallicbonding

Account for the following:(i) Mn is more stable than Fe+7.towards oxidation to +3 state.(ii) The enthalpy of atomisation is lowestfor Zn in first series (3d) of thetransition elements. Delhi 2014

Answer»

1)Electronic configuration of Mn2+is [Ar]183d5.

Electronic configuration of Fe2+is [Ar]183d6.

It is known that half-filled and fully-filled orbitals are more stable. Therefore, Mn in (+2) state has a stable d5configuration. This is the reason Mn2+shows resistance to oxidation to Mn3+. Also, Fe2+has 3d6configuration and by losing one electron, its configuration changes to a more stable 3d5configuration. Therefore, Fe2+easily gets oxidized to Fe+3oxidation state.

2)The more extensive themetallic bonding of an element, the more will be its enthalpy of atomization. In all transition metals (except Zn, electronic configuration: 3d10 4s2), there are someunpairedelectrons that account for their strongermetallicbonding

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