Fe, Fe2+ & fe3+ Electron Configuration:11 Facts To Consider


In this article we want to discuss fe,fe2+ and fe3+ electron configuration with 11 facts regarding this.

Fe is the 3d series element. It belongs to metal family and is a member of 1st series transition element. Its atomic number is 26 i.e. it contains 26 protons in it. It belongs to group 8 and period 4. The molecular weight of fe is 55.845amu.

Fe Electron Configuration

In this case, at first 1s orbital is filled up with 2 electrons (which has least energy) as 1s orbital can accommodate maximum of 2 electrons. After 1s orbital electrons enters into 2s subshell which also holds maximum 2 electrons. Then electron goes into 2p orbital which can hold maximum 6 electrons.

After that 3s orbital is filled with 2 electrons, by the similar way mentioned above 3p subshell filled with 6 electrons. After electron goes to 4s orbital instead of 3d orbital as 3d orbital is lower in energy than 4s orbital. After fulfilling 4s orbital with2 electron, remaining 6 electrons goes to 3d orbital making the outermost shell fe electron configuration is 4s2 3d6.

Ground state electronic configuration of Fe

Fe3+ Ground State Electron Configuration

When 3 electrons are removed from neutral fe atom fe3+ ion is formed. The ground state fe3+ electron configuration is 1s2 2s2 2p6 3s2 3p6 3d5. First 2 electrons are removed from 4s orbital as because it has higher energy than 3d orbital and then 1 electron removed from 3d orbital making the valance shell electronic configuration of fe3+ is 3d5.

When 3 electrons are removed from fe atom it contains 5 electrons in the outermost shell i.e. 3d orbital has 5 electrons which is half-filled. As fe3+ ion has stable half-filled 3d orbital and also 1s,2s, 3s orbitals have fulfilled 2 electrons and 3p orbital have stable fulfilled 6 electrons in them it is more stable than fe atom where fe atom has 6 electrons in 3d orbital.

fe3+ electron configuration
Ground state electronic configuration of Fe3+

Fe3+ Abbreviated Electron Configuration

To know the abbreviated fe3+ electron configuration first of all we must know the abbreviated electronic configuration of fe atom. The abbreviated fe electron configuration is [Ar] 3d6 4s2. By counting the electrons from 1s to 3p orbital we find that there is a total number of 18 electrons and we replace it by writing in the form of [Ar].

When 3 electrons are realized from fe atom, fe3+ ion is formed and the electronic configuration of fe3+ ion in abbreviated form is [Ar] 3d5 i.e. 2 electrons are removed from 4s orbital as it is higher in energy than 3d orbital and then 1 electron is removed from remaining 3d orbital making it stable half-filled electronic configuration of fe3+ ion.

Fe3+ Condensed Electron Configuration

To know the condensed fe3+ electron configuration first of all we must know the condensed electronic configuration of fe atom. The condensed electronic configuration of fe is [Ar] 3d6 4s2. By counting the electrons from 1s to 3p orbital we find that there is a total number of 18 electrons.

When 3 electrons are realized from fe atom, fe3+ ion is formed and the electronic configuration of fe3+ ion in condensed form is [Ar] 3d5 i.e. 2 electrons are removed from 4s orbital and 1 electron is removed from remaining 3d orbital making it stable half-filled electronic configuration of fe3+ ion.

Fe3+ Noble gas Electron Configuration

When 3 electrons are removed from neutral fe atom fe3+ ion is formed. The noble gas fe3+ electron configuration is 1s2 2s2 2p6 3s2 3p6 3d5. 1st 2 electrons are removed from 4s orbital as because it has higher energy than 3d orbital and then 1 electron removed from 3d orbital making the valance shell electronic configuration of fe3+ is 3d5.

When 3 electrons are removed from fe atom it contains 5 electrons in the outermost shell i.e. 3d orbital has 5 electrons which is half-filled. By counting the electrons from 1s to 3p there are a total of 18 electrons i.e. fe3+ acquire nearest noble gas configuration of [18Ar] 3d5.

Fe2+ Ground State Electron Configuration

When 2 electrons are removed from neutral fe atom fe2+ ion is formed. The ground state fe2+ electron configuration of fe2+ is 1s2 2s2 2p6 3s2 3p6 3d6. 2 electrons are removed from 4s orbital as it has higher energy than 3d orbital making the valance shell electronic configuration of fe2+ is 3d6.

When 2 electrons are removed from fe atom it contains 6 electrons in the outermost shell i.e. 3d orbital has 6 electrons. fe2+ is less stable than fe3+ as fe2+ has 6 electrons in d shell which is just 1 electron excess to the stable half-filled d5 configuration of fe2+ ion. Also it is less stable than fe atom due to the fact every charged species is less stable than neutral atom.

"fe2+ electron configuration
fe3+ electron configuration
fe electron configuration"
Ground state electronic configuration of Fe2+

Fe2+ Subshell Electron Configuration

we know elemental Fe is neutral in nature it also contain same no of electrons in it i.e. it has 26 electrons as well. We distribute the 26 electrons in various subshell which is done according to aufbau principle. The subshell fe electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d6

When 2 electrons are removed from 4s subshell fe2+ ion is formed. The subshell electronic configuration of fe2+ is 1s2 2s2 2p6 3s2 3p6 3d6. From the subshell electronic configuration of fe2+ ion we see that there are 2 electrons in 1s subshell,2 each in 2s and 3s subshell, 6 electrons in both 2p and 3p subshell and 6 electrons in the last 3d subshell.

Fe2+ Condensed Electron Configuration

To know the condensed electronic configuration of fe2+ first of all we must know the condensed electronic configuration of fe atom. The condensed electronic configuration of fe is [Ar] 3d6 4s2. By counting the electrons from 1s to 3p orbital we find that there is a total number of 18 electrons.

We also know that 18 electrons are present in noble gas Ar and we replace it in the electronic configuration of fe by writing it in the form of [Ar]. When 2 electrons are realized from fe atom, fe2+ ion is formed and the electronic configuration of fe2+ ion in condensed form is [Ar] 3d6 i.e. 2 electrons are removed from 4s orbital.

Fe2+ Noble gas Electron Configuration

When 2 electrons are removed from neutral fe atom fe2+ ion is formed. The noble gas fe2+ electron configuration of fe2+ is 1s2 2s2 2p6 3s2 3p6 3d6. These 2 electrons are removed from 4s orbital as because it has higher energy than 3d orbital.

When 2 electrons are removed from fe atom it contains 6 electrons in the outermost shell i.e. 3d orbital has 6 electrons. By counting the electrons from 1s to 3p there are a total of 18 electrons i.e. fe2+ acquires nearest noble gas configuration of [18Ar] 3d6.

Fe+4 Electron Configuration

When 4 electrons are removed from neutral fe atom fe4+ ion is formed. The ground state fe3+ electron configuration is 1s2 2s2 2p6 3s2 3p6 3d4. First 2 electrons are removed from 4s orbital and then 2 electrons removed from 3d orbital making the valance shell electronic configuration of fe4+ is 3d4.

When 4 electrons are removed from fe atom it contains 4 electrons in the outermost shell i.e. 3d orbital has 4 electrons. fe3+ ion is more stable than fe+4 ion. This is due to the fact that fe3+ has stable half-filled electronic configuration of d5 but fe4+ has d4 configuration which is 1 electron short to that of stable d5 configuration.

"fe2+ electron configuration
fe3+ electron configuration
fe electron configuration"
Electronic configuration of Fe4+

How many electrons are in Fe3+?

The ground state fe3+ electron configuration is 1s2 2s2 2p6 3s2 3p6 3d5. We see from electronic configuration that there are a total of 23 electrons out of which 6 electrons in s-orbital, 12 electrons in p-orbital, and 5 electrons in d orbital.

Does Fe3+ have a noble gas electronic configuration?

No, fe3+ does not have a noble gas electronic configuration. fe3+ contains a total of 23 electrons which does not match with any noble gases.

Conclusion

By checking the electronic configuration of fe, fe2+, fe3+, we see that fe3+ is most stable. This is because of the fact that fe3+ has stable half-filled d5 configuration.

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