Properties of iron atoms

Ionisation Energies and electron affinity

The electron affinity of iron is 15.7  kJ mol-1. The ionisation energies of iron are given below.

Ionisation energy number Enthalpy /kJ mol-1
1st 762.5
2nd 1561.9
3rd 2957
4th 5290
5th 7240
6th 9560
7th 12060
8th 14580
9th 22540
10th 25290
11th 28000
12th 31920
13th 34830
14th 37840
15th 44100
16th 47206
17th 122200
18th 131000
19th 140500
20th 152600
21st 163000

Ionisation energies of Fe

Electronic configuration

The following represents the electronic configuration and its associated term symbol for the ground state neutral gaseous atom. The configuration associated with iron in its compounds is not necessarily the same.

Iron's "busy" spectrum is a natural, irregular wavelength scale with which to calibrate spectrographs and help assign unknown spectral lines.

Pointer to The Orbitron gallery of orbitals.

Kossel shell structure of Fe
A schematic representation of the shell structure of iron - not what the atom of iron "looks like".

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iron atomic number