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Why is the third IE of Fe lower than that of Mn?
AFe3+ has a d6 configuration
BFe2+ to Fe3+ gives stable d5
CIron has lower nuclear charge
DMn2+ to Mn3+ gives stable d5
Answer & Solution
Correct answer: B. Fe2+ to Fe3+ gives stable d5
Removing an electron from d6 Fe2+ produces the stable half-filled d5 ion, while Mn2+ would have to lose its stable d5 arrangement.
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