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Question
Answer the following
Iron exhibits +2 and +3 oxidation states. Write their electronic configuration. Which will be more stable? Why ?
Solution
i. Electronic configuration of Fe2+ : 1s2 2s2 2p6 3s2 3p6 3d6
ii. Electronic configuration of Fe3+ : 1s2 2s2 2p6 3s2 3p6 3d5
iii. Fe3+ is more stable than Fe2+. This is due to the presence of half filled ‘d’ orbital in Fe3+ .
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