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d and f BLOCK ELEMENTS
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Why is the ionisation enthalpy of Fe2+ lower than that of Mn2+ according to the text?
A. Fe2+ has a d6 configuration while Mn2+ has a d5 configuration, making Fe2+ easier to ionise
B. Mn2+ has a more stable configuration than Fe2+
C. Fe2+ has a higher nuclear charge
D. Mn2+ has a lower effective nuclear charge
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