What is the electron configuration of iron 3+?

1 Answer
anor277
Jul 14, 2018

Follow the "Aufbau scheme"...

Explanation:

For iron, Z=26..

And so for atomic ion we gots…

underbrace(1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^6)_"electronic configuration of atomic iron"

And for Fe^(2+)...we have TWO ELECTRONS LESS.... As is typical for the transition metal series, these are conceived to be "s-shell" rather than "d-shell".

Fe^(2+):underbrace(1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^6)_"electronic configuration of ferrous ion"

You are going to have to read your text for a fuller understanding of why we insist that the "s-shell" electrons are removed first...

And so what is the electronic configuration of "ferric ion", Fe^(3+)?

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