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The d-And-f-Block Elements
Give reason:
E° value for a Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+.
Mn3+/ Mn2+ has large + value because Mn3+ reduced to Mn+2 which has a half-filled d-orbital configuration ([Ar]4s03d5).
On the other hands, Fe3+/ Fe2+ has small +ve value because Fe3+ is much more stable than Fe2+. Electronic configuration of Fe3+ is [Ar]4s2 3d5 and Fe2+ [Ar]4s2 3d6.
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How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?
The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?
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