Ion Fe^2-

Symbol	Fe2-
Number	26
Atomic weight	55.8450000
Latin name	Ferrum
English name	Iron

How to build an electronic configuration by yourself? See link

Electronic configuration of of Iron

Fe: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶ → Fe^2-:1s²2s²2p⁶3s²3p⁶4s²3d⁸

Same electronic configuration has an ion of Iron -2 and Mn^-3, Co^-1, Ni, Zn⁺², Ga⁺³, Ge⁺⁴, As⁺⁵, Se⁺⁶, Br⁺⁷

The order of filling the shells with electrons of Iron (Fe^2-): 1s → 2s → 2p → 3s → 3p → 4s → 3d → 4p → 5s → 4d → 5p → 6s → 4f → 5d → 6p → 7s → 5f → 6d → 7p.

On the sub level ‘s’ there might be 2 electrons at most, on ‘p’ - up to 6, on ‘d’ - up to 10 and up to 14 on ‘f’

Iron has 26 electrons, let's fill electronic layers in described order:

2 electrons on 1s-sub level

2 electrons on 2s-sub level

6 electrons on 2p-sub level

2 electrons on 3s-sub level

6 electrons on 3p-sub level

2 electrons on 4s-sub level

8 electrons on 3d-sub level

Oxidation state of Iron

Atoms of Iron in compounds have an oxidation state of 6, 5, 4, 3, 2, 1, 0, -1, -2.

The oxidation state is the conditional charge of an atom in a compound: the bond in a molecule between atoms is based on the sharing of electrons, thus, if the atom’s charge virtually increases, then the oxidation state is negative (electrons carry a negative charge), if the charge decreases, then the oxidation state is positive.

Oxidation state of an ion Fe^2- = -2

Ions of Iron

Valence of Fe^2-

Atoms of Iron in compounds have valence VI, V, IV, III, II, I.

Valence of Iron is an ability of an atom Fe to build chemical bounds. The valence is based on electronic configuration of atom: electrons participated in chemical bounds are known as valence electrons. In general the valence is:

The number of possible chemical bounds with other atoms

The valence has no sign.

Quantum numbers Fe ^2-

Quantum numbers are defined by the last electron in configuration, for an ion Fe these numbers are N = 3, L = 2, M_l = 0, M_s = -½

Filling an electronic configuration (gif):



Result: