What is the noble gas electron configuration of an iron cation with a 3+ charge Fe3+?

  You need to write the

 electron configuration

 of Fe3+ using noble gas

 notation.


Remember that the atomic number of iron is 26.


Here is the electron configuration of Fe^3+ using noble gas notation:

[Ar]3d⁵

The noble gas argon is used here.The atomic number of argon is 18.

Remember that the d subshell has five orbitals.Each orbit can take maximum two electrons.
In the ground-state electron configuration of Fe3+, how many unpaired electrons are present?


In case of filling degenerate orbits ,each orbital will take one electron before pairing by the second electron according to Hunds' rule.

The Fe^3+ ion has five unpaired electrons.That is why it is paramagnetic.

The Fe^3+ has 26 protons but 23 electrons.

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