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Question

what is electronic configuration of fe 3+ ion( atomic no - 26)

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Solution

Ground state electronic configuration of Fe is

1s​2 2s2 2p6 3s2 3p6 3d6 4s2

When Fe is oxidised to Fe3+, it loses 3 electrons and then the electronic configuration is

1s​2 2s2 2p6 3s2 3p6 3d5

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